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Copper metal can be prepared by roasting...

Copper metal can be prepared by roasting copper ore, which contain cuprite `(Cu_(2)S)` and copper sulfide. (CuS)
`Cu_(2)S (s) + O_(2) (g) rarr 2Cu (s) + SO_(2) (g)`
`CuS (s) + O_(2) (g) rarr Cu (s) + SO_(2) (g)`
If ore contains 14.6% impurity in addition to a mixture of CuS and `Cu_(2)S`. Heating 100 gm of mixture produces 70 gm of Cu metal with 90% purity. `[Cu = 63]`
Percentage (By mass ) of CuS in the sample is :

A

0.095

B

0.38

C

0.19

D

0.57

Text Solution

Verified by Experts

The correct Answer is:
B
% by mass of `CuS = (0.4 xx 95 xx 100)/(100) = 38%`
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