Question

(a) Give two examples of metals that are poor
conductors of heat.
(b) Metals generally do not give hydrogen gas
when react with HNO2. Why?
(c) List two observations when is highly reactive
metal is dropped in water.
(5)​

Answer 1

Explanation:

a) lead and mercury

b) metal do not give hydrogen gas when react with hno3 because hno3 is strong oxidizing agent

c) there will be formation of hydrogen gas and the reaction may produce high amount of heat

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Answer 2

Answer:

1. Lead and Chromium are the metals which are poor conductor of heat.

2. Metals generally do not produce Hydrogen gas when reacts with HNO3 because, HNO3 is a strong oxidizing agent. Hence it do not produce Hydrogen gas

3. Two observations are-

- There will be vigorous reaction.

- There may be explosion.