Page 4 - Microsoft Word - Module-1

ASSIGNMENT

1. The best reducing agent in group-1 is _________.

2. Why do alkali metals have low density?

3. What happens when K burns in air? Give chemical

equation.

4. Why are alkali metals not found in nature?

5. Explain why is sodium less reactive than potassium?

HOME ASSIGNMENT

1. When an alkali metal dissolves in liquid ammonia the

solution can acquire different colours. Explain the

reasons for this type of colour change.

2. Why are K and Cs, rather than Li use in photoelectric

cells?

3. What happens when:

(i) Na metal is dropped in water?

(ii) Na metal is heated in free supply of air?

4. Why do alkali metals impart colour to flame?

5. Why do alkali metals have low melting and boiling

points?