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  • During the reaction of some metals with dilute hydrochloric acid, following observations were made. (a) Silver metal does not show any change

During the reaction of some metals with dilute hydrochloric acid, following observations were made.

(a) Silver metal does not show any change

(b) The temperature of the reaction mixture rises when aluminium(Al) is added.

(c) The reaction of sodium metal is found to be highly explosive

(d) Some bubbles of a gas are seen when lead (Pb) is reacted with the acid.

Explain these observations giving suitable reasons.

Answers (1)

a) There will not be any reaction between silver and dilute HCl as silver lies in low reactive series of metals.

b) When aluminium is added, it is an exothermic reaction and temperature increases

c) Sodium is highly reactive metal. It reacts with atmospheric oxygen to form exothermic reaction which result in temperature increases.

d) When lead reacts with acid it produces hydrogen gas which are responsible for the formation of bubbles.

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