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Standard XII
Chemistry
Question

Which of the following is least reactive?
  1. Yellow phosphorus
  2. Black phosphorus
  3. Red phosphorus
  4. White phosphorus

A
Red phosphorus
B
White phosphorus
C
Yellow phosphorus
D
Black phosphorus
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Solution
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Black phosphorus is thermodynamically most stable form of phosphorus as it is a highly polymerised form of phosphorus. Hence it is least reactive.

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