Q.

6 x 10-3 mole K2Cr2O7 reacts completely with 9 x 10-3 mole Xn+ to give XO3− and Cr3+. The value of n is :

Moderate

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None of these

answer is A.

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Detailed Solution

K2Cr2O7+Xn+⟶X5+O3−+Cr3+6x10-3 x 6 =(5 -n)x9 x10-3 n=1

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