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प्रश्न
Balance the following equation by the oxidation number method.
\[\ce{Cu + HNO3 -> Cu(NO3)2 + NO2 + H2O}\]
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उत्तर
\[\ce{Cu + 2HNO3 -> Cu(NO3)2 + NO2 + H2O}\]
\[\ce{Cu + 2HNO3 + 2HNO3 -> Cu(NO3)2 + 2NO2 + 2H2O}\]
\[\ce{Cu + 4HNO3 -> Cu(NO3)2 + 2NO2 + 2H2O}\]
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