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Q.

The number of moles of K2Cr2O7 that will be needed to react completely with one mole of ferric sulphite in acidic medium is

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a

0.4

b

0.6

c

1.0

d

0.8

answer is C.

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Detailed Solution

Fe2SO32⟶2Fe3++3SO32−Fe3+ is already in oxidised state hence Cr2O72− is not required by Fe3+SO32− is oxidised to SO42− by Cr2O72− in acidic medium 3SO32−+Cr2O72−+8H⟶2Cr3++3SO43++4H2O1moleFe2SO3⇌3moleSO32−≡1moleCr2O72−
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