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Q.

What volume of hydrogen gas at 273 K and1 atmospheric pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen ?

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a

22.4L

b

89.6L

c

67.2L

d

44.8L

answer is C.

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Detailed Solution

Reaction : 2BCl3+3H2⟶2B+6HCl           …(1)  3×22.4L      2×10.8gWt. of boron B=21.6gNo.of moles of Boron =wM=21.610.8=2                         2 moles of Boron requires 67.2 L H2 gas
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