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উত্তপ্ত কপারেরে উপর দিয়ে

H N O_{3}

C u (N O_{3})_{2} + H_{2}

C u O + N O + H_{2} O

C u O + N O_{2} + H_{2} O

C u O + N_{2} + H_{2} O

ANS : 4

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