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ICSE Class 10 Chemistry 2023 Paper

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Study the following observations and name the anions present in each of the reactions.
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Question : 58 of 88
Marks: +1, -0
When a crystalline solid ' P\mathrm{P} ' is warmed with concentrated H2SO4\mathrm{H}_2\mathrm{SO}_4 and copper turnings a reddish brown gas is released.
Solution:  
' P\mathrm{P} ' is copper nitrate, when it warmed with conc. H2SO4\mathrm{H}_2\mathrm{SO}_4 and copper turnings, a reddish brown gas nitrogen dioxide is released.
Cu(NO3)2(P)+H2SO4+Cu→2CuSO4\underset{(P)}{\mathrm{Cu}(\mathrm{NO}_3)_2} + \mathrm{H}_2\mathrm{SO}_4 + \mathrm{Cu} \rightarrow 2\mathrm{CuSO}_4   +2NO2+2H2O\; + 2\mathrm{NO}_2 + 2\mathrm{H}_2\mathrm{O}
Anion is NO3−\mathrm{NO}_3^{-} (Nitrate)
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