1.

In the reaction the stoichiometry coefficients of Cr_(2)O_(7)^(2-) , NO_2^(-) and H^(+) respectively are Cr_(2)O_(7)^(2-) +NO_(2)^(-) +H^(+) rarr Cr^(3+) +NO_(3)^(-) +H_(2)O

Answer»

1,3,8
1,4,8
1,3,12
1,5,12

Solution :`Cr_(2)O_(7)^(-2) +3NO_2^(-) +8H^(+) rarr 2Cr^(3+) +3NO_(3)^(-)+4H_(2)O`


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