set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

Aluminium is used in thermite welding because –

a) aluminium is a strong oxidising agent

b) aluminium is a light metal

c) aluminium has more affinity for oxygen

d) aluminium is a reactive metal

Question : 2

Acids and bases are important because of

a) their effects on human health

b) their effect on farmer’s crop

c) their use in industry

d) all the above are correct.

Question : 3

Which chemical compound is present in Bleaching Powder?

a) Calcium Oxychloride

b) Calcium Carbonate

c) Calcium Hydroxide

d) Ammonium Chloride

Question : 4

Match List-I with List-II:

a) 4 1 2 3

b) 4 2 3 1

c) 1 3 4 2

d) 3 2 1 4

Question : 5

The following equation is an example of a redox reaction, in which Cl₂ is the oxidizing agent and FeBr₃ is the reducing agent :
2FeBr₃ (aq) + 3Cl₂ (g) = 2FeCl ₃(aq) + 3Br₂ (1)
Which one among the following statements is incorrect for this redox reaction?

a) Reducing agents are themselves oxidized

b) Oxidizing agents are themselves reduced

c) Reducing agents gain or appear to gain electrons

d) Oxidizing agents oxidize other substances

Question : 6

When a few drops of lemon are mixed with milk

1. It turns sour
2. No change takes place
3. Properties of milk are changed
4. Properties of milk remain the same

a) (i) and (ii)

b) (i) and (iii)

c) (ii) and (iii)

d) (i) only