Question

: Assertion (A) : Active metals reacts with acids to liberate Hydrogen gas.
Reason (B) It is an example of displacement reaction.
a) Both A and R are true and R is the correct explanation of A b) Both A and R are true and R is not correct explanation of A c) A is correct and R is incorrect. d) A is incorrect and R is correct.​

Answer 1

a) Both A and R are true and R is the correct explanation of A

• The reaction between metals and acids is always accompanied by liberation of hydrogen gas and formation of salt. Action of liberation is even faster when the metal is more reactive.
• Some examples of such active metals are Zinc , Aluminium, Iron etc. Hence, the given assertion is true.
• This reaction between acid and metals is a displacement reaction because there's a displacement of hydrogen from its place by a metal with lower reduction potential that is more reactive than hydrogen. Hydrogen is liberated during the reaction.
• Hence, Both A and R are true and R is the correct explanation of A.