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Question
Balance the following equation by the oxidation number method.
\[\ce{K2Cr2O7 + Kl + H2SO4 -> K2SO4 + Cr2(SO4)3 + I2 + H2O}\]
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Solution
\[\ce{K2Cr2O7 + 6Kl + H2SO4 -> K2SO4 + Cr2(SO4)3 + I2 + H2O}\]
\[\ce{K2Cr2O7 + 6Kl + H2SO4 -> K2SO4 + Cr2(SO4)3 + 3I2 + H2O}\]
\[\ce{K2Cr2O7 + 6Kl + 7H2SO4 -> 4K2SO4 + Cr2(SO4)3 + 3I2 + 7H2O}\]
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