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Balance the following equations by oxida...

Balance the following equations by oxidation number method
(iii) `Cu+HNO_(3)to Cu(NO_3)_2+NO_(2)+H_2O`

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`Cu+2HNO_3 to Cu(NO_3)_2 +NO_2_H_2O`
`Cu+2HNO_3+2HNO_3 to Cu(NO_3)_2+2NO_2+2H_2O`
`Cu+2HNO_3 to Cu(NO_3)_2+2NO_2+2H_2O`
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SURA PUBLICATION-BASIC CONCEPTS OF CHEMISTRY AND CHEMICAL CALCULATIONS-EVALUATION (II.WRITE BRIEF ANSWER TO THE FOLLOWING QUESTIONS)
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