A)
X
Y
Mixture of \[Cu\] and \[CuO\]
Mixture of \[Cu\] and \[S{{O}_{2}}\]
B)
X
Y
Mixture of \[C{{u}_{2}}O,C{{u}_{2}}S\] and \[S{{O}_{2}}\]
Mixture of \[Cu\] and \[S{{O}_{2}}\]
C)
X
Y
Mixture of \[CuO\] and \[S{{O}_{2}}\]
Mixture of \[Cu\] and \[S{{O}_{2}}\]
D)
X
Y
Mixture of \[Cu\]and \[CuO\]
Mixture of \[CuO\]and \[CuS\]
Correct Answer: C
Solution :
\[C{{u}_{2}}S\] on roasting forms copper oxide and sulphur dioxide gas escapes out. Roasting copper oxide and left over \[C{{u}_{2}}S\] in the absence of air forms copper metal and \[S{{O}_{2}}\] gas is evolved.
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