Question

A student was given Mn, Zn, Fe, and Cu metals. Identify which of thema) Will not displace H2 from dil HCl.b) Will react only with steam to give H2 gas.c) Will give H2 with 5% HNO3

Answer 1

(a) Cu (b) Zn and Fe (c) Mn bcoz only Manganese and Magnesium will react with HNO3

Answer 2

Hey dear,

● Answer -
a) Cu
b) Fe
c) Zn

● Explanation -
1) Except copper, other metals react with HCl to liberate H2.
Mg + 2HCl --> MgCl2 + H2
Zn + 2HCl --> ZnCl2 + H2
2Fe + 6HCl --> 2FeCl3 + 3H2

2) Iron will react with only steam to give H2 gas.
2Fe + 3H2O --> Fe2O3 + 3H2

3) Zinc will give H2 with 5% HNO3.
Zn + 2HNO3 --> Zn(NO3)2 + H2

Hope this helps you...