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In the equation: `M+8CN^(-)+2H_(2)O+O_(2)to4[M(CN)_(2)]^(-)+4OH^(-)` metal M is:A. CopperB. IronC. GoldD. Zinc |
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Answer» Correct Answer - C Least reactive metals like silve (Ag ) and gold (Au) are obtained by cyanide proces. In this process, the impure metal is treated with NaCN (solution ) and air is passed. Metal is converted into soluble complex as `4Au+8CN^(-) +2H_(2)O+O_(2) to underset("Soluble")(4[Au(CN)_(2)]^(-))+4OH^(-)` |
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