set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

Which of the statements given below is/are correct?
The permanent hardness of water is due to the presence of soluble.

1. chloride of calcium
2. bicarbonate of calcium
3. sulphate of magnesium
4. bicarbonate of magnesium

a) 2 and 4

b) 1 and 3

c) 1 only

d) 1, 2 and 3

Question : 2

The chemical composition of diamond is

a) Carbon

b) Nickel

c) Nitrogen

d) Zinc

Question : 3

Match List-I with List-II :

a) A – (4); B – (2); C – (1); D – (3); E – (5)

b) A – (1); B – (4); C – (2); D – (3); E – (5)

c) A – (4); B – (1); C – (2); D – (5); E – (3)

d) A – (4); B – (1); C – (2); D – (3); E – (5)

Question : 4

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

a) Hydrogen

b) Nitrogen

c) Oxygen

d) Carbon

Question : 5

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 : 6

Food cans are coated with tin and not with zinc because

a) zinc is more reactive than tin

b) zinc has a higher melting point than tin

c) zinc is costlier than tin

d) zinc is less reactive than tin