Salts of nitric acid are called nitrates. How many of the following nitrates give both O2 and NO2 by the action of heat, among KNO3,NH4NO3,CuNO32,PbNO32,AgNO3

CuNO32,PbNO32,AgNO3 on heating gives NO2&O22KNO3→∆ 2KNO2+O2 NH4NO3→∆ N2O+H2O 2Cu(NO3)2 →∆ 2CuO+4NO2+O2 2Pb(NO3)2 →∆ 2PbO+4NO2+O2 2AgNO3 →red heat 2Ag+NO2+O2

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Salts of nitric acid are called nitrates. How many of the following nitrates give both O₂ and NO₂ by the action of heat, among ${KNO}_{3}, {NH}_{4} {NO}_{3}, Cu {({NO}_{3})}_{2}, Pb {({NO}_{3})}_{2}, {AgNO}_{3}$

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answer is 3.

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Detailed Solution

$Cu {({NO}_{3})}_{2}, Pb {({NO}_{3})}_{2}, {AgNO}_{3}$ on heating gives ${NO}_{2} & O_{2}$

$2 {KNO}_{3} \overset{∆}{\to} 2 {KNO}_{2} + O_{2} {NH}_{4} {NO}_{3} \overset{∆}{\to} N_{2} O + H_{2} O 2 Cu {({NO}_{3})}_{2} \overset{∆}{\to} 2 CuO + 4 {NO}_{2} + O_{2} 2 Pb {({NO}_{3})}_{2} \overset{∆}{\to} 2 PbO + 4 {NO}_{2} + O_{2} 2 {AgNO}_{3} \overset{red heat}{\to} 2 Ag + {NO}_{2} + O_{2}$