D. The coefficients p, q, r, s in the reaction
p Cr,0,20+ q Fe20 ►r Cr3e + s Fe3e
+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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