On heating blue coloured powder of copper nitrate

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on heating blue coloured powder of copper (II) nitrate in a boiling tube copper oxide (black) oxygen gas aNd a brown gas X is formed ..1) write a balanced chemical equation ..2) identify the brown gas X ..3) type of reaction ..4) pH range of X l

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The copper(II)nitrate decomposes when heated to form the following products:
 1)balanced chemical equation:               
                                       Heat
                  2Cu(NO3)2 -------> 2CuO +O2 +4NO2
                     (S)                            (S)      (G)      (G)
                                                           reddish-brown

2)Brown gas is:
         Nitrogen(II)oxide gas

3)Type of reaction:
     A decomposition reaction

4)pH range of gas X (NO2):

  This gas is acidic


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