During the reaction of some metals with dilute hydrochloric acid, the following observations were made.
The reaction of sodium metal is found to be highly explosive because:

Heat is evolved

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Due to the catalyst

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It is an endothermic reaction

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It is an exothermic reaction

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Solution

The correct options are
A Heat is evolved
D It is an exothermic reaction
The reaction of sodium with hydrochloric acid is highly exothermic and therefore explosive in nature. Heat is evolved in an exothermic reaction.
$2 N a (s) + 2 H C l (a q) ⟶ 2 N a C l (a q) + H_{2} (g) + H e a t$

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Question 31
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.

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

Explain these observations giving suitable reasons.

The reaction of sodium metal is found to be highly explosive. Comment.

2 P b (N O_{3})_{2} (s) H e a t - -- \to 2 P b O (s) + 4 N O_{2} (g) + O_{2} (g)

is corrosion of metal an exothermic reaction or an endothermic reaction ??

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