Question

	Appearance	Reactions with dilute $HCl$	Reaction with Dilute $HN{O}_3$
Unknown metal 1	Dull grey solid with white oxide coating	Dissolved with bubbles of clear gas	Dissolved with bubbles of clear gas
Unknown metal 2	Solid, lustrous, smooth silver-grey surface	No reaction	Dissolved with bubbles of orange gas

Identify the gas(transparent) produced with the addition of dilute $HCl$ to unknown metal 1.

• A. ${Cl}_2$
• B. $H_2$
• C. $O_2$
• D. $C{O}_2$
• E. $N{O}_2$

Answer 1

Answer: (B)

$H_2$

Metals reacts with $HCl$ to liberate hydrogen gas.