The coefficients p, q, r, s in the reaction pCr2O7^(2-) + q Fe^(2⊕) → r Cr^(3⊕) + s Fe^(3⊕) + H2O respectively are :
The coefficients p, q, r, s in the reaction pCr2O72- + q Fe2⊕ → r Cr3⊕ + s Fe3⊕ + H2O respectively are :
a. 1, 2, 6, 6
b. 6, 1, 2, 4
c. 1, 6, 2, 6
d. 1, 2, 4, 6
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