On heating blue colour powder of copper 2 nitrate in a boiling tube,a black coloured compound X, Oxygen gas and a brown gas Y is formed. i) Write a balanced chemical equation of the reaction
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On heating blue coloured powder of copper II nitrate class 10 chemistry ... When this anhydrous copper (II) nitrate is further heated it gives a black residue of copper oxide and also gives out a brown gas i.e., of nitrogen dioxide and a colorless gas which is of oxygen. Therefore, the gases X and Y are oxygen and nitrogen dioxide respectively.
Explanation:
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CBSE
Chemistry
Grade 10
Chemical reactions and equations
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On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide, a colourless gas X and a brown gas Y is formed.
1.) Identify the gases X and Y.
2.) Identify the type of chemical reaction involved.
3.) Write a balanced chemical equation of the above reaction.
Answer
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Hint: When copper nitrate is heated, it loses the water molecule, and then when it is further heated, it decomposes further to give a brownish and a colorless gas.
Complete step by step solution:
The chemical formula of copper (II) nitrate is Cu(NO3)2. It is a blue-colored solid powder and the anhydrous form of this compound forms deep blue-green crystals.
The heating of copper (II) nitrate, results in the loss of a water molecule. When this anhydrous copper (II) nitrate is further heated it gives a black residue of copper oxide and also gives out a brown gas i.e., of nitrogen dioxide and a colorless gas which is of oxygen. Therefore, the gases X and Y are oxygen and nitrogen dioxide respectively.
In this reaction, as copper (II) decomposes to form copper oxide, nitrogen dioxide gas, and oxygen gas as products, therefore, it is a decomposition reaction.
The balanced chemical equation involved in this reaction is given below:
2Cu(NO3)2(s)−→−−Heat2CuO(s)+4NO2(g)Reddish−browngas+O2Colorlessgas
Note: The copper nitrate is a very toxic chemical for aquatic life. The nitrogen dioxide gas that is formed in this reaction is acidic in nature. Therefore, its pH will be in the range of 0 to 7.