Purification And Characterisation Of Organic Compounds Question 5
Question: Complexes formed in the following methods are
I. Mond’s process for purification of nickel. II. Removal of lead poisoning from the body. III. Cyanide process for extraction of silver. IV. Froth flotation process for separation of ZnS from galena ore by using depressant.
Options:
A) I. II. III. IV. $ Ni{{( CO )}_4} $ $ [Pb{{( EDTA ]}^{2-}} $ $ {{[Ag{{( CN )}_2}]}^{-}} $ $ [Zn{{(CN)}_2}] $
B) I. II. III. IV. $ Ni{{( CO )}_4} $ $ [Pb{{( EDTA ]}^{2-}} $ $ {{[Ag{{( CN )}_2}]}^{-}} $ $ {{[Zn{{(CN)}_4}]}^{2-}} $
C) I. II. III. IV. $ Ni{{( CO )}_6} $ $ [Pb{{( EDTA ]}^{4-}} $ $ {{[Ag{{( CN )}_2}]}^{-}} $ $ {{[Zn{{(CN)}_6}]}^{4-}} $
D) I. II. III. IV. $ Ni{{( CO )}_4} $ $ [Pb{{( EDTA ]}^{2-}} $ $ {{[Ag{{( CN )}_4}]}^{3-}} $ $ {{[Zn{{(CN)}_4}]}^{2-}} $
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Answer:
Correct Answer: B
Solution:
[b] (I) Mond’s process $ \underset{Impure}{\mathop{Ni}}+4CO\xrightarrow{{{50}^{{}^\circ }}C}\underset{Volatilecomplex}{\mathop{[ Ni{{( CO )}_4} ]}} $
$ \xrightarrow{200{}^\circ C}\underset{Pure}{\mathop{Ni}}+4CO\uparrow $
(II) Removal of lead poisoning $ P{{b}^{2+}}+EDT{{A}^{4-}}\rightarrow {{[Pb(EDTA)]}^{2-}} $
(III) Cyanide process for extraction of silver $ 2Ag+4NaCN+H_2O+\frac{1}{2}O_2\rightarrow $
$ 2Na[ Ag{{(CN)}_2} ]+2NaOH $
(IV) Separation of ZnS from galena by using depressant in froth flotation process
BETA
