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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. 0.095B. 0.38C. 0.19D. 0.57 |
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Answer» Correct Answer - B % by mass of `CuS = (0.4 xx 95 xx 100)/(100) = 38%` |
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