In the reaction the stoichiometry coefficient of Cr2O7−2 , NO2− and H+ respectively are Cr2O7−2+NO2−+H+→ Cr+3+NO3−+H2O

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1, 3, 8

1, 4, 8

1, 3, 12

1, 5, 12

answer is A.

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Detailed Solution

1_Cr2O7−2+8_H++3_NO2−→2Cr+3+ 4H2O+3NO3−

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