Chemistry - Chemical Reactions Questions for SSC CGL

Question 1

Coating iron with a thin layer of zinc to prevent rusting is called:

Accepted Answer

Galvanisation

Answer

Vulcanisation

Answer

Electroplating with tin

Answer

Alloying

Question 2

Heating calcium carbonate to form calcium oxide and carbon dioxide is an example of:

Accepted Answer

Thermal decomposition

Answer

Neutralisation

Answer

Displacement

Answer

Combination

Question 3

When a magnesium ribbon burns in air with a dazzling white flame, it forms:

Accepted Answer

Magnesium oxide

Answer

Magnesium chloride

Answer

Magnesium carbonate

Answer

Magnesium hydroxide

Question 4

Quick lime reacts vigorously with water to form slaked lime. This is an example of a:

Accepted Answer

Combination reaction

Answer

Double displacement reaction

Answer

Decomposition reaction

Answer

Displacement reaction

Question 5

Mixing solutions of sodium sulphate and barium chloride gives a white precipitate of:

Accepted Answer

Barium sulphate

Answer

Sodium sulphate

Answer

Sodium chloride

Answer

Barium chloride

Question 6

When fats and oils in food get oxidised, their smell and taste change. This is called:

Accepted Answer

Rancidity

Answer

Corrosion

Answer

Fermentation

Answer

Saponification

Question 7

The chemical formula of rust is:

Accepted Answer

Fe2O3·xH2O

Answer

Fe3O4

Answer

FeSO4

Answer

FeO

Question 8

Which of the following is an endothermic process?

Accepted Answer

Decomposition of calcium carbonate on heating

Answer

Respiration

Answer

Reaction of quick lime with water

Answer

Burning of natural gas

Question 9

When an iron nail is placed in copper sulphate solution, the blue colour of the solution fades and turns greenish. The reaction is a:

Accepted Answer

Displacement reaction

Answer

Decomposition reaction

Answer

Combination reaction

Answer

Neutralisation reaction

Question 10

In the reaction CuO + H2 -> Cu + H2O, which substance is oxidised?

Accepted Answer

Hydrogen

Answer

Water

Answer

Copper oxide

Answer

Copper

Question 11

Heating lead nitrate produces brown fumes of:

Accepted Answer

Nitrogen dioxide

Answer

Bromine vapour

Answer

Sulphur dioxide

Answer

Chlorine

Question 12

When ferrous sulphate crystals are heated strongly, which gases are released (apart from water vapour)?

Accepted Answer

Sulphur dioxide and sulphur trioxide

Answer

Carbon dioxide and carbon monoxide

Answer

Nitrogen dioxide and oxygen

Answer

Hydrogen and oxygen

Question 13

In the balanced equation for the reaction of iron with steam, 3Fe + __H2O -> Fe3O4 + __H2, what number fills both blanks?

Accepted Answer

4

Answer

3

Answer

2

Answer

6

Chemistry - Chemical Reactions Questions for SSC CGL (with Answers)

Q1. Coating iron with a thin layer of zinc to prevent rusting is called:

Q2. Heating calcium carbonate to form calcium oxide and carbon dioxide is an example of:

Q3. When a magnesium ribbon burns in air with a dazzling white flame, it forms:

Q4. Quick lime reacts vigorously with water to form slaked lime. This is an example of a:

Q5. Mixing solutions of sodium sulphate and barium chloride gives a white precipitate of:

Q6. When fats and oils in food get oxidised, their smell and taste change. This is called:

Q7. The chemical formula of rust is:

Q8. Which of the following is an endothermic process?

Q9. When an iron nail is placed in copper sulphate solution, the blue colour of the solution fades and turns greenish. The reaction is a:

Q10. In the reaction CuO + H2 -> Cu + H2O, which substance is oxidised?

Q11. Heating lead nitrate produces brown fumes of:

Q12. When ferrous sulphate crystals are heated strongly, which gases are released (apart from water vapour)?

Q13. In the balanced equation for the reaction of iron with steam, 3Fe + H2O -> Fe3O4 + H2, what number fills both blanks?

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