NEET Chemistry (general) MCQ Question
Which of the following statements about phosphine and black phosphorus is correct?
Phosphine is prepared by the reaction of calcium phosphide with water or dilute HCl.
α-Black phosphorus does not oxidise in air and is formed by heating white phosphorus at high pressure.
β-Black phosphorus can burn in air at temperatures above 673 K.
Both α-black phosphorus and β-black phosphorus are formed by heating red phosphorus in a sealed tube.
Correct Answer
Detailed Explanation
Phosphine is indeed prepared by the reaction of calcium phosphide with water or dilute HCl, as stated in the NCERT context. α-Black phosphorus is formed from red phosphorus, while β-black phosphorus is formed from white phosphorus under high pressure and does not burn in air up to 673 K.
Found an issue with this question?