Question

Oxalate ion, 2 C O2 4 − , and permanganate ion, MnO4 − , react in aqueous basic solution to give carbonate

ion, 2 CO3 − , and solid manganese dioxide, MnO2. The unbalanced chemical equation is a 2 C O2 4 − (aq) + b MnO4 − (aq) + c OH − → x 2 CO3 − (aq) + y MnO2(s) + z H2O(l). What is the ratio a:c when the equation is balanced?

A. 3:2 B. 2:3 C. 1:1 D. 3:4 E. 1:2

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