Question

Consider the following reaction sequence:
Metal (M) $\stackrel{\text{very dil.}HN{O}_3}{\to }$ no reaction
Metal (M) $\stackrel{Conc.HN{O}_3}{\to }$ light blue solution (A) + gas (B)
The incorrect statement(s) is(are) :

• A. gas (B) is diamagentic
• B. solution (C) contain only $NaN{O}_2$ salt
• C. dark blue solution is paramagnetic
• D. metal (M) is extracted by thermite process

Answer 1

Answer: (A), (B), (D)

The correct options are
A gas (B) is diamagentic
B solution (C) contain only $NaN{O}_2$ salt
D metal (M) is extracted by thermite process

On considering the following reaction sequence:
Metal (M) $\stackrel{\text{very dil.}HN{O}_3}{\to }$ no reaction
Metal (M) $\stackrel{Conc.HN{O}_3}{\to }$ light blue solution (A) + gas (B)

$Cu+4HN{O}_3\to Cu(N{O}_3{)}_2+2N{O}_2+2H_{2}O$

Gas is $N{O}_2$ and is paramagnetic. Copper is not extracted by thermite process.

Solution C contains $NaN{O}_2+NaN{O}_3$.