set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

While tinning of brass utensils, the ammonium chloride powder used to clean the hot utensil produces fumes of

a) hydrochloric acid

b) carbon monoxide

c) ammonia

d) ammonia and hydrochloric acid

Question : 2

Which of the following is the most common element in the Universe?

a) Hydrogen

b) Nitrogen

c) Oxygen

d) Carbon

Question : 3

Select the correct statements:

1. Plants use CO₂ during the process of photosynthesis
2. CO₂ dissolved in water reacts with limestone present in rocks to form A which is absorbed by marine animals. Compound A helps in the formation of shells by marine animals.
3. The % of oxygen in the air dissolved in water is about 32- 35%.
4. Aquatic animals use dissolved oxygen to respire.

a) 1, 3 and 4

b) 2 and 4

c) 1, 2 and 3

d) 1, 2, 3 and 4

Question : 4

Consider the following statements :

1. Among the nitrogenous fertilizers used, urea contains maximum percentage of N.
2. The mixture of calcium sulphate and calcium dihydrogen phosphate is known as superphosphate of lime.
3. Potassium magnesium sulphate is called the muriate of potash.

a) 1 and 3

b) 2 and 3

c) 1 and 2

d) 1, 2 and 3

Question : 5

What is the usual property of oxides of Group III and IV?

a) Basic and acidic

b) Acidic

c) Basic

d) Neutral

Question : 6

Match List-I with List-II :

a) 1 2 3 4

b) 2 1 3 4

c) 1 2 4 3

d) 2 1 4 3