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Assertion (A) : beta-Black phosphorus is formed when red phosphorus is heated in a sealed tube at 803 K. Reason (R) : Phosphine is a colourless gas with rotten fish smell and is highly poisonous.

Answer»

Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct EXPLANATION of the Assertion (A)
Both Assertion (A) and RENSON (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A)
Assertion (A) is correct, but Reason (R) is INCORRECT statement.
Assertion (A) is incorrect, but Reason (R) is correct statement.

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