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Which of the following statements is/are true ?A. In process of the precipitation of silver from sodium dicyano argentate (I), the zinc acts as a reducing agent as well as complexing agentB. In the process of roasting , the copper pyrites is converted into a mixture of `Cu_2S` and FeS which, in turn, are partially oxidised.C. Limonite, haematite and magnesite are ores of ironD. Tin and lead both are extracted from their ores by carbon reduction. |
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Answer» Correct Answer - A,B,D ( C)Magnesite `(MgCO_3)` is ore of magnesium. (D) `SnO_2+2CtoSn+2CO` `PbS+3O_2 to 2PbO+2SO_2` `PbO+CtoPb+CO` |
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