1.

Consider the following steps : Cu_2S overset"Roast in air"to A overset"Heating without air"to B Which of the following is/are the correct statement(s)?

Answer»

It INVOLVES self-reduction.
A is only `Cu_2O` and B is a mixture of CU and `SO_3`
A is mixture of `Cu_2O` and `Cu_2S` and B is a mixtureof Cu and `SO_2`.
The SOLIDIFIED COPPER obtained has blisteredappearance.

Solution :`2Cu_2S + 3O_2 to 2Cu_2O + 2SO_2`
`2Cu_2O + Cu_2S to 6Cu+ SO_2`
The solidified copper obtained has blistered appearance due to the EVOLUTION of `SO_2` and therefore , it is called blister copper.


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