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a
Red ‘P’ is obtained by heating white ‘P’ at 573K in an inert atmosphere for several days
b
black phosphorous is formed when red ‘P’ is heated in a sealed tube at 803 K.
c
black ‘P’ is prepared by heating white ‘P’ at 473 K under pressure
d
When red ‘P’ is heated under high pressure, white ‘P’ is obtained.
answer is D.
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