Question

When metal z is added to delute acid there is evolution gas metal is?

Answer 1

Every acids are composed of H2 gas so we need a metal that could displace Hydrogen

so all the metals more reactive than Hydrogen can be Z

for eg

Zinc + HCl -------> Zncl2 + H2

Answer 2

Answer: Ag (silver)

Explanation:

As it is less reactive than hydrogen

So silver can't be able to replace hydrogen from hcl