Question

The treatment of galena with $HNO _3$ produces a gas that is

• A. paramagnetic
• B. bent in geometry
• C. an acidic oxide
• D. colorless

Answer 1

Answer: (A), (D)

paramagnetic

Answer 2

PbS + dil. HNO3 → Pb(NO3)2 + S + NO + H2O

NO is paramagnetic due to the presence of unpaired electrons. It is a neutral oxide. It is colourless.

Hence, (A) and (D) are correct statements.