| [A] In the Aluminothermite process, aluminium acts as reducing agent. |
| [B] The process of extraction of gold involves the formation of \[{{[Au{{(CN)}_{2}}]}^{-}}\] and \[{{[Zn{{(CN)}_{4}}]}^{2-}}\]. |
| [C] In the extractive metallurgy of zinc, partial fusion of \[ZnO\]with coke is called sintering and reduction of ore to the molten metal is called smelting. |
| [D] Extractive metallurgy of silver from its ore argentite involves complex formation and displacement by more electropositive metal. |
| Choose the correct options - |
A) A and B
B) B and C
C) A, B and C
D) A, B, C and D
Correct Answer: D
Solution :
| [A] \[C{{r}_{2}}{{O}_{3}}+2Al\xrightarrow{{}}\overset{+3}{\mathop{A{{l}_{2}}}}\,{{O}_{3}}+2Cr\] |
| [B] \[Au+2C{{N}^{-}}+{{H}_{2}}O+\frac{1}{2}{{O}_{2}}\] \[\xrightarrow{{}}{{[Au{{(CN)}_{2}}]}^{-}}+2O{{H}^{-}}\]\[2{{[Au{{(CN)}_{2}}]}^{-}}+Zn\to {{[Zn{{(CN)}_{4}}]}^{2-}}+2Au\] |
| [C] Statement is true |
| [D] \[A{{g}_{2}}S+4NaCN\xrightarrow{{{O}_{2}}}2Na[Ag{{(CN)}_{2}}]+N{{a}_{2}}S\] |
| \[2Na[Ag{{(CN)}_{2}}]+Zn\xrightarrow{{}}N{{a}_{2}}[Zn{{(CN)}_{4}}]+2Ag\] |
You need to login to perform this action.
You will be redirected in
3 sec
