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Question

Which of the following is true for allotropes of phosphorus?
  1. Yellow phosphorus is soluble in CS2 while red phosphorus is not.
  2. P---P---P bond angle is 60 in red phosphorus.
  3. On heating in air, white phosphorus changes to red.
  4. White phosphorus with slowly change to red phosphorus at ordinary temperatures.

A
P---P---P bond angle is 60 in red phosphorus.
B
Yellow phosphorus is soluble in CS2 while red phosphorus is not.
C
On heating in air, white phosphorus changes to red.
D
White phosphorus with slowly change to red phosphorus at ordinary temperatures.
Solution
Verified by Toppr

Structure of red phosphorus is regarded as a polymer consisting of chains of P4 tetrahedral linked together by covalent bond.
On heating in air, white phosphorus changes to black P.

Yellow phosphorus is soluble in CS2 while red phosphorus is not.

P---P---P bond angle is 109 in red phosphorus.

Red phosphorus is formed by heating yellow phosphorus, between 240-250oC, in presence of an inert gas.

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