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AIIMS 201826 May

Exam: AIIMS
Year: 2018
Date: 26 May
Subject: Chemistry
Chapter: p Block Elements (Group 15, 16, 17 & 18)

AIIMS 2018 · 26 May · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Which of the following statements is incorrect?

Which of the following statements is incorrect?

Options

A $\alpha$ -Black phosphorus is formed by heating red phosphorus.
B $\beta$ -Black phosphorus does not burn in air upto $875 \mathrm{~K}$ .
CWhite phosphorus readily catches fire in air to give dense fumes of $\mathrm{P}_4 \mathrm{O}_{10}$ .
DRed phosphorus does not react with caustic alkalies.

Correct answer

B. $\beta$ -Black phosphorus does not burn in air upto $875 \mathrm{~K}$ .

Step-by-step solution

\beta

-Black phosphorus does not burn in air upto

673 \mathrm{~K}

.

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