Question

. 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.
​

Answer 1

Answer:

a silver metal is less reactive than hudrogen therefor it cannot displace h2 from dil. hcl

b aluminiumis a reactive metal therefor the reactiom aluminium with dil. hcl is an exothermic reaction.

Al+HCl =AlCl3 +h2

c it is because sodium is a highly reactive metal and reacts vigrously with dil. HCl.

thanks

Answer 2

Answer:

(i) Silver is a very less reactive metal (as it placed below hydrogen in reactivity series). Thus, it does not react withdil. HCl.  

(ii) The reaction of Al with dil. HCl is exothermic, i.e. heat is produced in the reaction, hence the temperature of the reaction mixture rises.  

(iii) Sodium is a very reactive metal. It reacts vigorously with the evolution of heat too.

Explanation: Hope you will better understand it.