44) Balance the following equations by oxidation number method
i) K,Cr,0, + KI + H2SO4 → K2SO4 + Cr2(SO4)3 +12+H,0
ii) KMnO4 + Na2SO3 → MnO2 + Na,SO4 + KOH
iii) Cu+ HNO3 → Cu(NO3)2 + NO2+ H2O
iv) KMnO4+H2C2O4 + H2SO4 → K2SO4 + MnSO4 + CO2 + H2O
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Answer:
KI + H2SO4→ K2SO4 + I2 + SO2 + H2O.
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Write an unbalanced equation.
Assign oxidation number for each atom.
Separate out reactions into two half reactions.
Balance all other atoms except H and O in each half reaction.
Balance the hydrogen by H+ or OH− .
Balance the oxygen atoms by H2O.
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Kl + H2SO4 → K2SO4 + Cr2(SO4)3 + 12H2O
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