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Select the correct option for the following statements.(I) Red phosphorus gives α-black phosphorus when heated in a sealed tube at 803 K.(II) White phosphorus gives β-black phosphorus when heated under high pressure at 473K.(IV) Black phosphorus burns in air above 673 K.

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a

I and II

b

I, ll and III

c

I, II and IV

d

All I to IV

answer is D.

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Detailed Solution

Select the correct option for the following statements.(I) Red phosphorus gives α-black phosphorus when heated in a sealed tube at 803 K.(II) White phosphorus gives β-black phosphorus when heated under high pressure at 473K.(IV) Black phosphorus burns in air above 673 K.

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Select the correct option for the following statements.(I) Red phosphorus gives α-black phosphorus when heated in a sealed tube at 803 K.(II) White phosphorus gives β-black phosphorus when heated under high pressure at 473K.(IV) Black phosphorus burns in air above 673 K.