Chemistry
When copper reacts with a hot dilute solution, reddish-brown fumes are observed. Another compound, P, having the same anion that is present in the hot solution on heating, melts into a colourless liquid, releasing only oxygen gas without any coloured fumes. Identify P.
Nitric Acid
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Answer
Sodium nitrate / Potassium nitrate
Reason — When copper reacts with a hot dilute solution, reddish-brown fumes of NO2 are observed.
Cu + 4HNO3 [dil.] ⟶ Cu(NO3)2 + 2H2O + 2NO2
Another compound, P, either Sodium nitrate or Potassium nitrate having the same anion NO3-, that is present in the hot solution, on heating, melts into a colourless liquid, releasing only oxygen gas without any coloured fumes.
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