During the reaction of some metals with dilute hydrochloric acid, the following observations were made. The temperature of the reaction mixture rises when aluminium (Al) is added mainly 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
C It is an exothermic reaction.
The temperature of the reaction mixture rises beacause, the following exothermic reaction takes place:
$2 A l (s) + 6 H C l (a q) \to 2 A l C l_{3} (a q) + 3 H_{2} (g) + h e a t$

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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.

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

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During the reaction of some metals with dilute hydrochloric acid, the following observations were made. The temperature of the reaction mixture rises when aluminium (Al) is added mainly because :

The correct options are A Heat is evolved C It is an exothermic reaction.The temperature of the reaction mixture rises beacause, the following exothermic reaction takes place:2Al(s)+6HCl(aq)→2AlCl3(aq)+3H2(g)+heat

The correct options are
A Heat is evolved
C It is an exothermic reaction.
The temperature of the reaction mixture rises beacause, the following exothermic reaction takes place:
$2 A l (s) + 6 H C l (a q) \to 2 A l C l_{3} (a q) + 3 H_{2} (g) + h e a t$