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In acidic medium, K 2 Cr 2 O 7 shows oxidising action as represented in the half reaction : Cr 2 O 7 2– + XH + + Ye Θ → 2A + ZH 2 O X, Y, Z and A are respectively:

1. 8, 4, 6 and Cr 2 O 3
2. 14, 6, 7 and Cr 3+
3. 14, 7, 6 and Cr 3+
4. 8, 6, 4 and Cr 2 O 3

Correct answer: 14, 6, 7 and Cr 3+

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