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Standard XII
Chemistry
Question

Select the incorrect statement.
  1. Nitrous oxide supports combustion more vigorously than air
  2. Reactivity order of various allotropic forms of phosphorus is white > red > black
  3. Red phosphorus changes to white phosphorus on heating in the atmosphere of CO2 or coal gas at 573K
  4. Phosphorus pentaoxide dehydrates nitric acid forming nitrogen pentaoxide

A
Phosphorus pentaoxide dehydrates nitric acid forming nitrogen pentaoxide
B
Nitrous oxide supports combustion more vigorously than air
C
Reactivity order of various allotropic forms of phosphorus is white > red > black
D
Red phosphorus changes to white phosphorus on heating in the atmosphere of CO2 or coal gas at 573K
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Solution
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Option (D) is correct.
(D) : Red phosphorus changes to black phosphorus on heating in the atmosphere of CO2 or coal gas at 573K.
It is obtained by heating white phosphorus at 573K in an inert atmosphere for several days.

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