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Q.

124 u of P4 will contain :

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a

4 atoms of phosphorus 

b

1 molecule of  phosphorus 

c

4 NA atoms of phosphorus 

d

NA molecule of  phosphorus 

answer is B, C.

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Detailed Solution

The atomic mass of P = 31 amu.

Molecular mass of P4 = 4 × 31 = 124 amu.

Now, 124 g of P4 contains 1 mole of P4 = NA molecules of Phosphorus=4NA atoms of P(Phosphorus).

 

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