Question

Give reasons for the following :
(i) Generally no hydrogen gas is evolved when meatals react with dilute nitric acid.
(ii) Sodium hydroxide solution cannot be kept in aluminium containers.
(iii) Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time.
(iv) Sodium is obtained by the electrolysis of its molten chloride and not from its aqeous solution.
(v) Aluminium reacts with dilute hydrochloric acid slowly in the beginning.

Answer 1

1)because nitric acid is a week acid and when diluted it becomes more week
2) because it react with it and and create New compound
3) silver do not tarnish due to oxygen
it reacts with sulfer present in air and form black coating on it
4)as it shows different properties when added to water
5)because it takes time for HCl to fully start reaction
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