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Question

The volume of HNO3 (having specific gravity of 1.05g/mL containing 8% by mass of HNO3) required to oxidize iron in 1gFeSO47H2O in acid medium as Fe2++HNO3+H+Fe3++NO+H2O is x×101. The value of x is :

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Solution

Fe2++HNO3+H+Fe3++NO+H2O
(+5) (+2)
Number of equivalents of HNO3= Number of equivalents of Fe+2
V×1.05×8100×21=1278
Therefore, V=0.89 mL.
Hence, volume of HNO3 required = 0.89 mL.

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