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Question

Discuss briefly giving an example, the role of coordination compound in 
extraction of metals.


Solution

The process of extraction of some of the metals from their ores involves the formation of complexes.
For eg. in aqueous solution, gold combines with cyanide ions to form $$\left[ { Au\left( CN \right)  }_{ 2 } \right] $$ from this solution, gold is later extracted by the addition of $$Zn-$$metal.
$$4Au+{ 16CN }^{ - }+6{ H }_{ 2 }O+{ O }_{ 2 }\longrightarrow { 4\left[ Au{ \left( CN \right)  }_{ 2 } \right]  }^{ - }+{ 12OH }^{ - }$$
$${ \left[ { Au\left( CN \right)  }_{ 2 } \right]  }^{ - }+Zn\longrightarrow { \left[ { Zn\left( CN \right)  }_{ 4 } \right]  }^{ 2- }+2Au$$

Chemistry

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