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Question:

When acidified K2Cr2O7 solution is added to Sn+2 salts, then Sn+2 changes to:

Sn

Sn4+

Sn2-

Sn3-

Solution:

Cr2O72- + 3Sn+2 + 14H+ → 3Sn4+ + 2Cr3+ + 7H2O
Sn gets oxidised from Sn+2 to Sn+4. Hence, option B is correct.