Question

H] Provide reason for the following :- [5]
i) Efflorescence is minimum during humid conditions.
ii) Group 1 [IA] elements are called alkali metals.
iii) Granulated zinc is preferred to metallic zinc in the preparation of hydrogen using dilute acid.
iv) Hydrogen is collected by the downward displacement of water and not air even though it is lighter
than air.
v) Gases have lower densities compared to solids or liquid

Answer 1

Answer:

Provide reason for the following :- [5]

i) Efflorescence is minimum during humid conditions.

ii) Group 1 [IA] elements are called alkali metals.

iii) Granulated zinc is preferred to metallic zinc in the preparation of hydrogen using dilute acid.

iv) Hydrogen is collected by the downward displacement of water and not air even though it is lighter

than air.

v) Gases have lower densities compared to solids or liquid