Chemical Reactions and Equations Multiple Choice Questions and Answers

1 Which of the following is not a physical change?

A Boiling of water to give water vapour

B Melting of ice to give water

C Dissolution of salt in water

D Combustion of Liquefied Petroleum Gas (LPG)

Answer: Combustion of Liquefied Petroleum Gas (LPG)

2 The following reaction is an example of a 4NH3 (g) + 5O2 (g) ⇨ 4NO + 6H2O • Displacement reaction • Combination reaction • Redox reaction • Neutralisation reaction

A (i) and (iv)

B (ii) and (iii)

C (i) and (iii)

D (iii) and (iv)

View Answer

Answer: (iii) and (iv)

3 Which of the following statements about the given reaction are correct? 3Fe (s) + 4H2O (g) ⇨ Fe3O4 (s) + 4H2 (g) I. Iron metal is getting oxidised II. Water is getting reduced III. Water is acting as reducing agent IV. Water is acting as oxidising agent

A (i), (ii) and (iii)

B (iii) and (iv)

C (i), (ii) and (iv)

D (ii) and (iv)

View Answer

Answer: (i), (ii) and (iv)

4 What is the chemical name for slaked lime?

A Calcium carbonate

B Calcium oxide

C Calcium hydroxide

D None of the above

View Answer

Answer: Calcium hydroxide

5 In which of the following category will you put the reaction of heating of ferrous sulphate?

A Decomposition reaction

B Combination Reaction

C Displacement reaction

D None of the above

View Answer

Answer: Decomposition reaction

6 What happens when silver chloride is put under sunlight?

A Silver metal and chlorine gas are formed

B Silver metal and hydrogen gas are formed

C Only silver metal is formed

D Only hydrogen gas is formed

View Answer

Answer: Silver metal and chlorine gas are formed

7 What happens when carbon dioxide is passed in lime water?

A Lime water turns milky because of formation of calcium carbonate

B Lime water turns milky because of formation of water

C Lime water turns red because of formation permanganate

D Lime water turns red because of formation of copper sulphate

View Answer

Answer: Lime water turns milky because of formation of calcium carbonate

8 Which of the following is formed when lead nitrate is put under thermal decomposition?

A Lead oxide

B Nitrogen dioxide

C Oxygen gas

D All of the above

View Answer

Answer: All of the above

9 Which of the following product is formed after heating of limestone?

A Calcium oxide

B Calcium carbonate

C Hydrogen gas

D All of the above

View Answer

Answer: Calcium oxide

10 In which of the following category will you put the reaction of heating of calcium carbonate?

A Decomposition reaction

B Thermal decomposition reaction

C Endothermic reaction

D All of the above

View Answer

Answer: All of the above

11 Heating of ferrous sulphate gives which of the following product?

A Ferric oxide

B Sulphur dioxide

C Sulphur trioxide

D All of the above

View Answer

Answer: All of the above

12 What is the another name of quick lime?

A Calcium hydroxide

B Calcium oxide

C Carbon dioxide

D Sodium oxide

View Answer

Answer: Calcium oxide

13 Which of the following product is formed when calcium oxide reacts with water?

A Slaked lime

B Carbon dioxide

C Calcium oxide

D Oxygen gas

View Answer

Answer: Slaked lime

14 In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?

A 2H2 (l) + O2 (l) → 2H2O (g)

B 2H2 (g) + O2 (l) → 2H2O (g)

C 2H2 (g) + O2 (g) → 2H2O (l)

D 2H2 (g) + O2 (g) → 2H2O (g)

View Answer

Answer: 2H2 (g) + O2 (g) → 2H2O (l)

15 Which one of the following processes involve chemical reactions?

A Storing of oxygen gas under pressure in a gas cylinder

B Liquefaction of air

C Keeping petrol in a China dish in the open

D Heating copper wire in the presence of air at high temperature

View Answer

Answer: Heating copper wire in the presence of air at high temperature

16 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?

A Lead sulphate (insoluble)

B Lead acetate

C Ammonium nitrate

D Potassium sulphate

View Answer

Answer: Lead acetate

17 Which of the following is (are) an endothermic process(es)? (i) Dilution of sulphuric acid (ii) Sublimation of dry ice (iii) Condensation of water vapours (iv) Evaporation of water

A Both (i) and (iii)

B Only (ii)

C Only (iii)

D Both (ii) and (iv)

View Answer

Answer: Both (ii) and (iv)

18 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 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.

A (i) and (ii)

B (ii) and (iii)

C (i) and (iv)

D None of the above

View Answer

Answer: (ii) and (iii)

19 Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved? (i) Displacement reaction (ii) Precipitation reaction (iii) Combination reaction (iv) Double displacement reaction

A Only (i)

B Only (ii)

C Only (iv)

D Only (iv)

View Answer