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On heating blue coloured powder of copper(II) nitrate in a boiling tube,

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On heating blue coloured powder of copper(Il) nitrate in a boiling tube, copper oxide (black), oxygen gas and a brown gas 'X' is formed. Identify the brown gas 'X'.
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2Cu(NO3) 2 (s)  ------>   Heat   2CuO(s) + O2(g)  +  4NO2(g)
CoPPer(II) nitrate CoPPer oxide
'X'is nitrogen dioxide gas.

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