SATHEE: Co-Ordination Compounds Question 72

Co-Ordination Compounds Question 72

Question: In the process of extraction of gold, Roasted gold ore $+ C N^{-} + H_{2} O \overset{O_{2}}{\to} [X] + O H^{-}$ $[X] + Z n \to [Y] + A u$ Identify the complexes [X] and [Y]

[IIT-JEE 2003]

Options:

A) $X = {[A u {(C N)}_{2}]}^{-},, Y = {[Z n {(C N)}_{4}]}^{2 -}$

B) $X = {[A u {(C N)}_{4}]}^{3 -},, Y = {[Z n {(C N)}_{4}]}^{2 -}$

C) $X = {[A u {(C N)}_{2}]}^{-},, Y = Z n {(C N)}_{6}]^{4 -}$

D) $X = {[A u {(C N)}_{4}]}^{-},, Y = {[Z n {(C N)}_{4}]}^{2 -}$

Show Answer

Answer:

Correct Answer: A

Solution:

$\underset{gold ore}{R o a s t e d}, + C N^{-} + H_{2} O \overset{O_{2}}{\to}, {[A u, {(C N)}_{2}]}^{-} + O H^{-}$

${[A u, {(C N)}_{2}]}^{, -} + Z n \to {[Z n, {(C N)}_{4}]}^{, 2 -}$ .

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Co-Ordination Compounds Question 72

Question: In the process of extraction of gold, Roasted gold ore +CN−+H2O→O2[X]+OH− [X]+Zn→[Y]+Au Identify the complexes [X] and [Y]

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Solution:

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Question: In the process of extraction of gold, Roasted gold ore $+ C N^{-} + H_{2} O \overset{O_{2}}{\to} [X] + O H^{-}$ $[X] + Z n \to [Y] + A u$ Identify the complexes [X] and [Y]