Question

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

Unknown metal #$2$ could be:

• A. silver
• B. copper
• C. zinc
• D. sodium

Answer 1

Answer: (A)

silver

The metal with a silver-grey color surface and lustrous is silver.

Silver reacts only with $HN{O}_3$ to form a salt and forms a clear gas of $N{O}_2$.

$2HN{O}_3+Ag\to AgN{O}_3+N{O}_2+H_{2}O$.

Ag does not react with $HCl$ because, in the reactivity series, Ag comes at the bottom of the series and it is below the hydrogen. So, it cannot react with $HCl$.

Hence option A is correct.