During the reaction of some metals with dilute hydrochloric acid, the 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 gas are seen when lead (Pb) is reacted with the acid.
Explain these observations giving suitable reasons.

AcademicChemistryNCERTClass 10

(a) Silver metal does not show any change because silver lies lower in the reactive series of metals hence it does not react with HCl.
(b) The temperature of the reaction mixture rises when aluminium (Al) is added because it is an exothermic reaction resulting in an increase in the temperature.
(c) Sodium is a highly reactive metal it reacts with atmospheric oxygen to form an exothermic reaction which results in a temperature increase.
(d) When lead reacts with acid it produces Hydrogen gas which is responsible for the formation of bubbles.
raja
Updated on 10-Oct-2022 13:27:09

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