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Zn+HNO3 (অতি লঘু) Zn(NO3)2+H2O+NH4NO3
Zn+HNO3(লঘু) Zn(NO3)2+H2O+N2O
Zn+HNO3(মধ্যম গাঢ়) Zn(NO3)2+H2O+NO
Zn+HNO3(গাঢ়) Zn(NO3)2+H2+NO2
ANS : 4
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