Question

Balance the following redox reaction by ion – electron method :

Cr2O7

2-

(aq) + SO2 (g)  Cr3+ (aq) + SO4

2-

(aq) (acidic medium)​

Answer 1

Answer:

Answer(a)-

Half-reaction

oxidation half SO_{2}+2H_{2}O\rightarrow SO_{4}^{2-}+4H^{+}+2e^{-}

reduction half Cr_{2}O_{7}^{2-}+14H^{+}+6e^{-}\rightarrow 2Cr^{3+}+3SO^{2-}+H_{2}O

balancing them by multiplying oxidation half by 3 and adding the reaction