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Q.

Cr2O7-2+NO2−1→mediumAcidCr+3+NO3-.Number of H+  ions participating in the net reaction are

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a

20

b

8

c

10

d

18

answer is B.

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Cr2O7-2+3NO2-+8H+→2Cr+3+3NO3-+4H2O
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