MCQ on Chemical Reaction and Equation

21- Reactions in which heat is released along with the formation of products are called

(A) Exothermic chemical reaction

(B) Endothermic chemical reaction

(C) Combination reaction

(D) None of the above

 

22- Which of the following is a example of exothermic reaction?

(A) Burning of food we eat

(B) Burning of natural gas

(C) Both A and B

(D) None of the above

 

23- The food we eat broken down into simpler substances during digestion to form a glucose and this glucose combines with oxygen in the cells of our body and provide …………………

(A) Nutrients

(B) Heat

(C) Energy

(D) All of the above

 

24- The food we eat broken down into simpler substances during digestion to form glucose and this glucose combines with oxygen in the cells of our body and provide energy. What is the special name of this reaction?

(A) Combination

(B) Endothermic

(C) Exothermic

(D) Respiration

 

25-In ……………..reaction a single reactant breaks down to give a simpler product.

(A) Endothermic

(B) Exothermic

(C) Respiration

(D) Decomposition

 

26- Choose the correct equation for the given word equation

Ferrous sulphate crystals loose water when heated and the colour of the crystal changes. It then decomposes to ferric oxide, sulphur trioxide.

(A) 2FeSO₄ (s) → Fe₂O₃(s) + SO₂ (g) + SO₃ (g)

(B) 2FeSO₄ (s) → Fe₂O₃(s) + SO₂ + SO₃ (g)

(C) 2FeSO₆ (s) → Fe₂O₃(s) + SO₂ (g) + SO₃ (g)

(D) 2FeSO₄ (s) → Fe₆ O₃(s) + SO₂ (g) + SO₃ (g)

 

 

27- When decomposition is carried out by heating, It is called

(A)Exothermic Reaction

(B) Thermal Decomposition

(C) Decomposition reaction

(D) None of the above

 

28- White silver chloride turns ………… in sunlight due to decomposition of silver chloride into silver and chorine by light.

(A) Black

(B) Pink

(C) Grey

(D) White

 

29- Reactions in which energy is absorbed are known as

(A) Chemical reaction

(B) Exothermic reaction

(C) Decomposition reaction

(D) Endothermic reaction

 

30- Iron has displaced or removed another element, copper, from copper sulphate solution. This reaction is called

(A) Displacement reaction

(B) Precipitation reaction

(C) Oxidation reaction

(D) Reduction reaction

 

ANSWERS:

21-(A), 22-(B), 23-(C), 24-(D), 25-(D), 26-(A), 27-(B), 28-(C), 29-(D), 30-(A)