Question

Name a metal for each case :
(a) It does not react with cold as well as hot water but reacts with steam.
(b) It does not react with any physical state of water.
ii. When calcium metal is added to water the gas evolved does not catch fi re but the same gas
evolved on adding sodium metal to water catches fi re. Why is it so ?

Answer 1

Answer:

a)iron, aluminium,zinc

b)gold,lead,copper,silver

Explanation:

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Answer 2

Answer:

A) iron

B) gold and silver.

C) When calcium metal is added to water, Hydrogen gas is evolved but the reaction is less violent and heat is not sufficient to catch fire. Whereas, in case when sodium is added to water, reaction is violent and exothermic reaction takes place. That’s why hydrogen gas catches fire.

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