The treatment of galena with $HNO _3$ produces a gas that is
- paramagnetic
- bent in geometry
- an acidic oxide
- colorless
The Correct Option is A, D
Solution and Explanation
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.
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Concepts Used:
General Principles and Processes of Isolation of Elements
What are Ores and Minerals?
Minerals are the naturally occurring, homogeneous inorganic solid substances. They are having a definite chemical composition and crystalline structure, hardness and color. For example, copper pyrite, calamine, etc.
Impurities in an ore are called gauge. The removal of a gauge from the ore is called concentration ore.
Several steps are involved in the extraction of pure metal from ores. Major steps are as follows –
- Concentration of the ore
- Isolation of the metal from its concentrated ore
- Purification of the metal