Question

Short answers (2 marks each):21. Give
reason for the following: (a) Nitric acid is
not preferred in laboratory preparation of
hydrogen. (b) Hydrogen is collected by
downward displacement of water.
Your answer​

Answer 1

Answer:

a) nitric acid is not used in the laboratory preparation of Hydrogen, because the Hydrogen gets oxidised, thereby defeating the purpose of the reaction.

b) As Hydrogen is lighter than air, it is collected through the downward displacement of water.

Explanation:

hope it helps you...

Answer 2

Answer:

(a) Nitric Acid is a very strong oxidizing agent. It oxidizes the Dihydrogen Gas produced during the reaction with metals to Water. That is why Nitric Acid cannot be used for the preparation of hydrogen gas.

(b) Hydrogen is collected by downward displacement of water as it is less denser than water. ... It is insoluble in water so it does not dissolve in water.