Chemical Reactions and Equations Mcqs (Objective) In English

Chemical Reactions and Equations Mcqs (Objective) In English, Class 10 Science MCQs Chapter 1 Chemical Reactions & Equations

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Class 10 Science MCQs Chapter 1 Chemical Reactions & Equations

Results

#1. In which of the following equations, the mass is not same on both the sides?

Word equation

Word equation

Skeletal equation

Skeletal equation

Balanced equation

Balanced equation

Both (a) and (b)

Both (a) and (b)

#2. Which among the following statement (s) is (are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to (i) the formation of silver by decomposition of silver chloride (ii) sublimation of silver chloride (iii) decomposition of chlorine gas from silver chloride (iv) oxidation of silver chloride

(i) only

(i) only

(i) and (iii)

(i) and (iii)

(ii) and (iii)

(ii) and (iii)

(iv) only

(iv) only

#3. Which among the following statement (s) is (are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to (i) the formation of silver by decomposition of silver chloride (ii) sublimation of silver chloride (iii) decomposition of chlorine gas from silver chloride (iv) oxidation of silver chloride

(i) only

(i) only

(i) and (iii)

(i) and (iii)

(ii) and (iii)

(ii) and (iii)

(iv) only

(iv) only

#4. Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous Cuso, and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statements(s) is (are) correct? (i) In beakers A and B, exothermic process has occurred. (ii) In beakers A and B, endothermic process has occurred. (iii) In beaker C exothermic process has occurred. (iv) In beaker C endothermic process has occurred.

(i) only

(i) only

(ii) only

(ii) only

(i) and (iii)

(i) and (iii)

(ii) and (iii)

(ii) and (iii)

#5. Corrosion of metals can be prevented

by coating the metal surface with a paint.

by coating the metal surface with a paint.

by applying film of grease and oil on the surface of the metal

by applying film of grease and oil on the surface of the metal

by covering the surface of the metal with another metal which is more electropositive

by covering the surface of the metal with another metal which is more electropositive

all of these

all of these

#6. Identify the chemical equation which represents a complete balanced equation for the reaction of barium chloride with sodium sulphate to produce barium sulphate and sodium chloride.

BaCl2(aq) + Na2­SO4(aq) → BaSO4(s) + NaCl(aq)

BaCl2(aq) + Na2­SO4(aq) → BaSO4(s) + NaCl(aq)

BaCl2(aq) + Na2­SO4(aq) → 2BaSO4(s) + 2NaCl(aq)

BaCl2(aq) + Na2­SO4(aq) → 2BaSO4(s) + 2NaCl(aq)

2BaCl2(aq) + Na2­SO4(aq) → 2BaSO4(s) + NaCl(aq)

2BaCl2(aq) + Na2­SO4(aq) → 2BaSO4(s) + NaCl(aq)

BaCl2(aq) + Na2­SO4(aq) → BaSO4(s) + 2NaCl(aq)

BaCl2(aq) + Na2­SO4(aq) → BaSO4(s) + 2NaCl(aq)

#7. Which of the following is not a physical change?

Boiling of water to give water vapour

Boiling of water to give water vapour

Melting of ice to give water

Melting of ice to give water

Dissolution of alt in water

Dissolution of alt in water

Combustion of Liquefied Petroleum Gas (LPG)

Combustion of Liquefied Petroleum Gas (LPG)

#8. Which among the following is (are) double displacement reaction(s)? (i) Pb + CuCl2 → PbCl2 + Cu (ii) Na2SO4 + BaCl2 → BaSO4 + 2NaCl (iii) C + O2 → CO2 (iv) CH4 + 2O2 → 2H2O

(i) and (iv)

(i) and (iv)

(ii) only

(ii) only

(i) and (ii)

(i) and (ii)

(iii) and (iv)

(iii) and (iv)

#9. Which of the following reactions are represents a combination reaction?

CaO (s) + H2­O (I) → Ca(OH)2(aq)

CaO (s) + H2­O (I) → Ca(OH)2(aq)

CaCO3 (s) → CaOH(s) + CO2

CaCO3 (s) → CaOH(s) + CO2

Zn (s) → CuSO4(aq) → ZnSO4 + Cu(aq)

Zn (s) → CuSO4(aq) → ZnSO4 + Cu(aq)

2FeSO4 → Fe2O3(s) + SO2(g) + SO3(g)

2FeSO4 → Fe2O3(s) + SO2(g) + SO3(g)

#10. Which of the following observation belp(s) us to determine that a chemical change has taken place?

Change in temperature.

Change in temperature.

Change in color

Change in color

Evolution of a gas.

Evolution of a gas.

All of these

All of these

#11. A dilute ferrous sulphate solution was gradually added to the beaker containing acidified potassium permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?

KMnO4 is an oxidising agent, it oxidises FeSO4

KMnO4 is an oxidising agent, it oxidises FeSO4

FeSO4 acts as an oxidising agent and oxidises KMnO4

FeSO4 acts as an oxidising agent and oxidises KMnO4

The color disappears due to dilution, no reaction is involved

The color disappears due to dilution, no reaction is involved

KMnO4 is an unstable compound and decomposes in presence of FeSO4 to a colourless compound

KMnO4 is an unstable compound and decomposes in presence of FeSO4 to a colourless compound

#12. Which of the following is (are) an endothermic processes? (1) Dilution of sulphuric acid. (ii) Sublimation of dry ice. (iil) Condensation of water vapours. (iv) Evaporation of water.

(i) and (iii)

(i) and (iii)

(ii) and (iii)

(ii) and (iii)

(i) and (iv)

(i) and (iv)

(iii) and (iv)

(iii) and (iv)

#13. Which one of the following processes involve chemical reactions?

Storing of oxygen gas under pressure in a gas cylinder

Storing of oxygen gas under pressure in a gas cylinder

Liquefaction of air

Liquefaction of air

Keeping petrol in a china dish in the open

Keeping petrol in a china dish in the open

Heating copper wire in presence of air at high temperature

Heating copper wire in presence of air at high temperature

#14. In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?

Lead sulphate (insoluble)

Lead sulphate (insoluble)

Lead acetate

Lead acetate

Ammonium nitrate

Ammonium nitrate

Potassium sulphate

Potassium sulphate

#15. Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed? (i) It is an endothermic reaction (ii) It is an exothermic reaction (iii) The pH of the resulting solution will be more than seven (iv) The pH of the resulting solution will be less than seven

(i) and (ii)

(i) and (ii)

(ii) and (iii)

(ii) and (iii)

(i) and (iv)

(i) and (iv)

(iii) and (iv)

(iii) and (iv)

#16. What happens when dilute hydrochloric acid is added to iron filings?

Hydrogen gas and iron (II) chloride are produced

Hydrogen gas and iron (II) chloride are produced

Chlorine gas and fertic hydroxide are produced

Chlorine gas and fertic hydroxide are produced

Heat is absorbed, e., lest tubes becomes cold

Heat is absorbed, e., lest tubes becomes cold

ron salt and water are produced

ron salt and water are produced

#17. The following reaction is an example of a 4NH3(8) + 5O2 (e) — 4NO(g)+ 6H2O(g) (i) displacement reaction (ii) combination reaction (iii) redox reaction (iv) neutralisation reaction

(I) and (iv)

(I) and (iv)

(ii) and (iii)

(ii) and (iii)

(i) and (iii)

(i) and (iii)

(iii) and (iv)

(iii) and (iv)

#18. Chemically rust is

lemne sulphate

lemne sulphate

ferric oxide

ferric oxide

dvdrated fenous oxide

dvdrated fenous oxide

hydrated fertic oxide

hydrated fertic oxide

#19. The chemical formula of lead sulphate is

Pb2SO4

Pb2SO4

Pb(SO4)2

Pb(SO4)2

PbSO4

PbSO4

Pb2(SO4)3

Pb2(SO4)3

#20. Both CO2 and H2 gases are

heavier than air

heavier than air

acidic in nature

acidic in nature

colourless

colourless

soluble in water

soluble in water

#21. Which of the following gases can be used for storage of fresh sample of an oil for a long time

Carbon dioxide or oxygen

Carbon dioxide or oxygen

Nitrogen or helium

Nitrogen or helium

Helium or oxygen

Helium or oxygen

Nitrogen or oxygen

Nitrogen or oxygen

#22. The electrolytic decomposition of water gives H, and 0, in the ratio of

2:1 by volume

2:1 by volume

1:2 by volume

1:2 by volume

8:1 by mass

8:1 by mass

1:2 by mass

1:2 by mass

#23. In the decomposition of lead (II) nitrate to give lead (II) oxide, nitrogen dioxide and gas, the coefficient of nitrogen dioxide (in the balanced equation) is

1

1

2

2

3

3

4

4

#24. Fatty foods become rancid due to the process of

reduction

reduction

corrosion

corrosion

oxidation

oxidation

hydrogenation

hydrogenation

#25. We store silver chloride in a dark coloured bottle because it

is a white solid

is a white solid

undergoes redox reaction

undergoes redox reaction

decomposes by sunlight

decomposes by sunlight

none of the above

none of the above

#26. Silver article turns black when kept in the open for a few days due to formation of

H2S

H2S

Ags

Ags

AgSO2

AgSO2

Ag2S

Ag2S

#27. When crystals of lead nitrate are heated strongly in a dry test tube

crystals immediately melt

crystals immediately melt

a brown residue is left

a brown residue is left

white fumes appear in the tube

white fumes appear in the tube

a yellow residue is left

a yellow residue is left

#28. Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Point out the correct observation.

The surface of metal becomes shining

The surface of metal becomes shining

The reaction mixture turns milky

The reaction mixture turns milky

Odour of a pungent smelling gas is recorded

Odour of a pungent smelling gas is recorded

A colourless and odourless gas is evolved

A colourless and odourless gas is evolved

#29. When carbon dioxide is passed through lime water,

calcium hydroxide is formed

calcium hydroxide is formed

white precipitate of CaO is formed

white precipitate of CaO is formed

lime water turns milky

lime water turns milky

colour of lime water disappears.

colour of lime water disappears.

#30. When a magnesium ribbon is burrnt in air, the ash formed is

black

black

white

white

yellow

yellow

pink

pink

#31. In which of the following, heat energy will be evolved?

Burning of L.P.G.

Burning of L.P.G.

Dissolution of NHCl in water

Dissolution of NHCl in water

Electrolysis of water

Electrolysis of water

Decomposition of AgBr in the presence of sunlight

Decomposition of AgBr in the presence of sunlight

#32. Rancidity can be prevented by

adding antioxidants

adding antioxidants

storing food away from light

storing food away from light

keeping food in refrigerator

keeping food in refrigerator

all of these

all of these

#33. The reaction of H2 gas with oxygen gas to form water is an example of ta ped

combination reaction

combination reaction

redox reaction

redox reaction

exothermic reaction

exothermic reaction

all of these reactions

all of these reactions

#34. The reaction in which two compounds exchange their ions to form two new compounds is called

displacement reaction

displacement reaction

combination reaction

combination reaction

double displacement reaction

double displacement reaction

redox reaction

redox reaction

#35. On immersing an iron nail in CuSO4 solution for few minutes, you will observe

no reaction takes place

no reaction takes place

The colour of solution changes to green

The colour of solution changes to green

the surface of iron nails acquire a black coating

the surface of iron nails acquire a black coating

the colour of solution fades away

the colour of solution fades away

#36. An element X on exposure to moist air turns reddish-brown and a new compound Y is formed. The substance X and Y are

X = Fe, Y = Fe2O3

X = Fe, Y = Fe2O3

X = Ag, Y = Ag2S

X = Ag, Y = Ag2S

X = Cu, Y = CuO

X = Cu, Y = CuO

X = Al, Y = Al2O3

X = Al, Y = Al2O3

#37. Which of the following is termed as oxidizing agent?

Which gives Oxygen

Which gives Oxygen

Which removes oxygen

Which removes oxygen

Which gives hydrogen

Which gives hydrogen

All of the above

All of the above

#38. Which of the following termed as reducing agent?

Which gives oxygen

Which gives oxygen

Which removes oxygen

Which removes oxygen

Which removes hydrogen

Which removes hydrogen

All of the above ol

All of the above ol

#39. Which of the following does show oxidation reaction?

Loss of oxygen

Loss of oxygen

Gain of oxygen

Gain of oxygen

Gain of hydrogen

Gain of hydrogen

None of the above

None of the above

#40. Which of the following does show reduction reaction?

Gain of oxygen

Gain of oxygen

Loss of oxygen

Loss of oxygen

Loss of hydrogen

Loss of hydrogen

None of the above

None of the above

#41. Which of the reaction is used in black and white photography?

Combination reaction

Combination reaction

Decomposition reaction

Decomposition reaction

Displacement reaction

Displacement reaction

Oxidation reaction

Oxidation reaction

#42. In which of the following heat is evolved?

Combination reaction

Combination reaction

Decomposition reaction

Decomposition reaction

Displacement reaction

Displacement reaction

Double displacement reaction

Double displacement reaction

#43. In which of the following heat is absorbed generally?

Combination reaction

Combination reaction

Decomposition reaction

Decomposition reaction

Displacement reaction

Displacement reaction

Double displacement reaction

Double displacement reaction

#44. Which of the following is termed as endothermic reaction?

Reaction in which heat is evolved

Reaction in which heat is evolved

Reaction in which heat is absorbed

Reaction in which heat is absorbed

Reaction in which there is loss of oxygen

Reaction in which there is loss of oxygen

Reaction in which there is gain of hydrogen

Reaction in which there is gain of hydrogen

#45. Which of the following is termed as exothermic reaction?

Reaction in which heat is evolved

Reaction in which heat is evolved

Reaction in which heat is absorbed

Reaction in which heat is absorbed

Reaction in which there is loss of oxygen

Reaction in which there is loss of oxygen

Reaction in which there is gain of hydrogen

Reaction in which there is gain of hydrogen

#46. What is the name of reaction which decomposes after supply of heat?

Combination reaction

Combination reaction

Thermal decomposition

Thermal decomposition

Displacement reaction

Displacement reaction

Redox reaction

Redox reaction

#47. What is the name of reaction in which both oxidation and reduction takes place?

Combination reaction

Combination reaction

Thermal decomposition

Thermal decomposition

Displacement reaction

Displacement reaction

Redox reaction

Redox reaction

#48. What is the name of substance which does get deposited over iron because of moisture present in air?

Sulphide

Sulphide

Rust

Rust

Carbonate

Carbonate

Oxygen

Oxygen

#49. Why magnesium ribbon is cleaned before burning?

To remove dust

To remove dust

To remove magnesium oxide

To remove magnesium oxide

To remove magnesium

To remove magnesium

All of the above

All of the above

#50. On the basis of evolution or absorption of heat, chemical reactions can be divided into how many types?

Two

Two

Three

Three

Four

Four

One

One

#51. Which of the following gas is produced when carbon is burnt in air?

Carbon dioxide

Carbon dioxide

Sulphur dioxide

Sulphur dioxide

Oxygen

Oxygen

Hydrogen

Hydrogen

#52. What happens when hydrogen reacts with oxygen?

Carbon dioxide is formed

Carbon dioxide is formed

Water is formed

Water is formed

Hydrogen carbonate is formed

Hydrogen carbonate is formed

All of the above

All of the above

#53. Which of the following product is formed when calcium oxide reacts with water?

Slaked lime

Slaked lime

Carbon dioxide

Carbon dioxide

Calcium oxide

Calcium oxide

Oxygen gas

Oxygen gas

#54. What is the another name of quick lime?

Calcium hydroxide

Calcium hydroxide

Calcium oxide

Calcium oxide

Carbon dioxide

Carbon dioxide

Sodium oxide

Sodium oxide

#55. What is the chemical name for slaked lime?

Calcium carbonate

Calcium carbonate

Calcium oxide

Calcium oxide

Calcium hydroxide

Calcium hydroxide

Carbon monoxide

Carbon monoxide

#56. Heating of ferrous sulphate gives which of the following product?

Ferric oxide

Ferric oxide

Sulphur dioxide

Sulphur dioxide

Sulphur trioxide

Sulphur trioxide

All of the above

All of the above

#57. In which of the following category will you put the reaction of heating of ferrous sulphate:

Decomposition reaction

Decomposition reaction

Combination reaction

Combination reaction

Displacement reaction

Displacement reaction

All of the above

All of the above

#58. In which of the following category will you put the reaction of heating of calcium carbonate?

Decomposition reaction

Decomposition reaction

Thermal decomposition reaction

Thermal decomposition reaction

Endothermic reaction

Endothermic reaction

All of the above

All of the above

#59. Which of the following product is formed after heating of limestone?

Calcium oxide

Calcium oxide

Calcium carbonate

Calcium carbonate

Hydrogen gas

Hydrogen gas

All of the above

All of the above

#60. What happens when silver chloride is put under sunlight

Silver metal and chlorine gas are formed

Silver metal and chlorine gas are formed

Silver metal and hydrogen gas are formed

Silver metal and hydrogen gas are formed

Only silver metal is formed

Only silver metal is formed

Only hydrogen gas is formed

Only hydrogen gas is formed

#61. Which of the following is formed when lead nitrate is put under thermal decomposition?

Lead oxide

Lead oxide

Nitrogen dioxide

Nitrogen dioxide

Oxygen gas

Oxygen gas

All of the above

All of the above

#62. What happens when carbon dioxide is passed through lime water?

Lime water turns milky because of formation of calcium carbonate

Lime water turns milky because of formation of calcium carbonate

Lime water turns milky because of formation of water

Lime water turns milky because of formation of water

Lime water turns red because of formation of permanganate

Lime water turns red because of formation of permanganate

Lime water turns red because of formation of copper sulphate

Lime water turns red because of formation of copper sulphate

#63. What happens when silver bromide is exposed to sunlight?

Hydrogen gas is formed

Hydrogen gas is formed

Bromine gas is formed

Bromine gas is formed

Chlorine gas is formed

Chlorine gas is formed

Iodine gas is formed

Iodine gas is formed

#64. Which metal is displaced when lead is put in the solution of copper chloride?

Lead

Lead

Copper

Copper

Chlorine

Chlorine

All of the above.

All of the above.

#65. Which of the following is formed when lead metal reacts with the solution of copper chloride?

No reaction takes place

No reaction takes place

Chlorine gas

Chlorine gas

Lead chloride

Lead chloride

Copper-lead complex

Copper-lead complex

#66. Which metal is displaced when zinc metal is put in the solution of copper sulphate

Copper

Copper

Zinc

Zinc

Sulphate

Sulphate

All of the above

All of the above

#67. What happens when sodium sulphate solution is mixed with the solution of barium chloride?

Barium sulphate is formed

Barium sulphate is formed

Sodium sulphate is formed

Sodium sulphate is formed

Sulphur dioxide gas is formed

Sulphur dioxide gas is formed

No reaction takes place

No reaction takes place

#68. What happens when copper metal is dipped in the solution of zinc sulphate?

Copper sulphate is formed

Copper sulphate is formed

Oxygen gas is formed

Oxygen gas is formed

Zinc metal is separated

Zinc metal is separated

No reaction takes place

No reaction takes place

#69. What happens when zine metal is dipped in the solution of copper sulphate?

Zinc sulphate is formed

Zinc sulphate is formed

Zinc oxide is formed

Zinc oxide is formed

Zinc sulphide is formed

Zinc sulphide is formed

No reaction takes place

No reaction takes place

#70. Why are articles made of iron painted to prevent rust?

Paint makes articles made of iron beautifiul

Paint makes articles made of iron beautifiul

Paint prevents iron articles to come in contact with moisture present in air.

Paint prevents iron articles to come in contact with moisture present in air.

Paint prevents iron articles from getting sticky

Paint prevents iron articles from getting sticky

All of the above

All of the above

#71. How rancidity can be prevented?

By adding antioxidants in food

By adding antioxidants in food

By adding more oxygen to food

By adding more oxygen to food

By keeping food items in open

By keeping food items in open

All of the above

All of the above

#72. Balanced equation of Fe + H2O → Fe3O4 + H2 is

Fe + 4H2O → Fe3O4+ H2

Fe + 4H2O → Fe3O4+ H2

Fe + 4H2O → Fe3+ 4H2

Fe + 4H2O → Fe3+ 4H2

3Fe + H2O → Fe3O4+ 4H2

3Fe + H2O → Fe3O4+ 4H2

3Fe + 4H2O → Fe3O4 + 4H2

3Fe + 4H2O → Fe3O4 + 4H2

#73. The formula of quick lime and the compound formed when it reacts with water

CaO , CaCO­3

CaO , CaCO­3

CaO , Ca(OH)2

CaO , Ca(OH)2

Ca(OH)2 , CaCO­3

Ca(OH)2 , CaCO­3

CaCO­3, Ca(OH)2

CaCO­3, Ca(OH)2

#74. A solution of which of the following compounds is used for whitewashing?

Suled line

Suled line

Quick Lime

Quick Lime

Blue vitriol

Blue vitriol

Limestone

Limestone

#75. Electrolysis of water is

Combination reaction

Combination reaction

Decomposition reaction

Decomposition reaction

Displacement reaction

Displacement reaction

None

None

#76. Lead nitrate Pb(NO3)2 on heating forms solid Lead oxide (PLO) and Nitrogen direide What is the colour of lead oxide and nitrogen dioxide?

White, Colourless

White, Colourless

White, Brown

White, Brown

Yellow. Brown

Yellow. Brown

Yellow. Colourless

Yellow. Colourless

#77. Silver chloride on exposure to sunlight decomposes into silver and chlorine gas. This is used in

Heat production as enormous energy is released

Heat production as enormous energy is released

Silver extraction as carth contains silver mainly in silver chloride form.

Silver extraction as carth contains silver mainly in silver chloride form.

Photography as grey silver formed produces an image imprint

Photography as grey silver formed produces an image imprint

None

None

#78. Quick lime is used in whitewashing because

it is cheap

it is cheap

it forms slaked lime with water which has a nice colour.

it forms slaked lime with water which has a nice colour.

it forms slaked lime with water which reacts with atmospheric carbon dioxide to for limestone

it forms slaked lime with water which reacts with atmospheric carbon dioxide to for limestone

None

None

#79. Example of a double displacement reaction will be

Metal with a salt

Metal with a salt

Metal with an acid

Metal with an acid

Metal with metal

Metal with metal

Salt with a salt

Salt with a salt

#80. Ferrous sulphate solution is green while ferric oxide formed by its decomposition is

red

red

white

white

brown

brown

yellow

yellow

#81. Corrosion or rusting of iron metal is

Oxidation of iron

Oxidation of iron

Reduction of iron

Reduction of iron

Displacement of iron

Displacement of iron

None

None

#82. To facilitate the electrolysis of water we add a few drops of acids like salphuric acid because

It acts as a catalyst

It acts as a catalyst

It prevents the decomposition of Electrodes used

It prevents the decomposition of Electrodes used

It makes the water a good conductor of electricity

It makes the water a good conductor of electricity

None

None

#83. Fried foods are packed with which gas to prevent Oxidation of fat?

Oxygen

Oxygen

Nitrogen

Nitrogen

Any of the abone

Any of the abone

None

None

#84. Which of the following statements about the reaction are correct? 3Fe (s) + 4H2O(g) → Fe3O4(s) + 4H3(g) (i) Iren metal is getting oxidised (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidising agent

(i),(ii) and (iii)

(i),(ii) and (iii)

(iii) and (iv)

(iii) and (iv)

i) (ii) and (iv)

i) (ii) and (iv)

(ii)and (iv)

(ii)and (iv)

#85. Which of the following is a displacement reaction?

MgCO3 → MgO + CO2

MgCO3 → MgO + CO2

2Na + 2H2O → 2NaOH + H2

2Na + 2H2O → 2NaOH + H2

2H2 + O2 → 2H2O

2H2 + O2 → 2H2O

2Pb(NO3) → 2PbO + 4NO2 + O2

2Pb(NO3) → 2PbO + 4NO2 + O2

#86. A substance X’is used in white-washing and is obtained by beating time stone in the absence of air. The substance ‘X’is

CaOCl2

CaOCl2

Ca(OH)2

Ca(OH)2

CaO

CaO

CaCO3

CaCO3

#87. Select the oxidising agent for the following reaction: H2S + I2 → 2HI + S

I2

I2

H2S

H2S

HI

HI

S

S

#88. A substance added to food containing fats and oils is called:

Oxidant

Oxidant

Rancid

Rancid

Coolant

Coolant

Antioxidant

Antioxidant

#89. The condition produced by serial oxidation of fats and oils in foods marked by unpleasant smell and taste is called:

antioxidation

antioxidation

reduction

reduction

rancidity

rancidity

corrosion

corrosion

#90. When SO2, gas is passed through saturated solution of H2S which of the following reaction occurs?

SO2 + 2H2S → 2H2O + 3S

SO2 + 2H2S → 2H2O + 3S

SO2 + 2H2S → H2O + 3S

SO2 + 2H2S → H2O + 3S

SO2 + H2S → 2H2O + S

SO2 + H2S → 2H2O + S

SO2 + H2S → SO3 + H2

SO2 + H2S → SO3 + H2

#91. What are the products formed when iron filings are heated with dilute hydrochloric acid?

Fe (III) chloride and water

Fe (III) chloride and water

Fe (II) chloride and water

Fe (II) chloride and water

Fe (II) chloride and hydrogen gas

Fe (II) chloride and hydrogen gas

Fe (III) chloride and hydrogen gas

Fe (III) chloride and hydrogen gas

#92. A student performs an experiment to form aluminium chloride from aluminium and chlorine. Which options gives the balanced chemical equation of the reaction?

3Al + 3Cl2 → 3AlCl3

3Al + 3Cl2 → 3AlCl3

2Al + Cl2 → 2AlCl

2Al + Cl2 → 2AlCl

2Al + 3Cl2 → 2AlCl3

2Al + 3Cl2 → 2AlCl3

Al + Cl2 → AlCl2

Al + Cl2 → AlCl2

#93. A researcher adds barium hydroxide to hydrochloric acid to form a white coloured barium chloride. Which option gives the balanced chemical equation of the reaction

HCl + 2Ba(OH) → 2BaCl2 + 2H2O + O2

HCl + 2Ba(OH) → 2BaCl2 + 2H2O + O2

HCl + Ba(OH) → BaCl2 + 2H2O

HCl + Ba(OH) → BaCl2 + 2H2O

HCl + Ba(OH) → BaH2 + 2H2O + O2

HCl + Ba(OH) → BaH2 + 2H2O + O2

HCl + 2Ba(OH) → BaH2 + 2H2O + O2

HCl + 2Ba(OH) → BaH2 + 2H2O + O2

finish

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