Question

Q1. Fill in the blanks: - [5 Marks]
(a) Non-Metals have
valency.
(b) Reactions which takes place in the presence of light are known as
(c) Upper layer of ice acts as an
and protects the fish and animals from cold.
(d) The component which dissolves is known as
(e) Neutrons were discovered by​

Answer 1

Explanation:

uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

Answer 2

Answer:

a. 1

b. When a molecule in the ground state absorbs light, one electron is excited to a higher orbital level. Hence, photochemical reactions are the reactions which occur in the presence of light.

c. When lakes and ponds freeze, the ice on the surface forms pockets of air and helps insulate the water so it doesn't freeze solid. ... Ice helps protect most aquatic plants and animals throughout the winter months.

d. Chadwick