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Question

Match List - I with List - II and select the correct answer using the codes given below:

List - I
(Ion involved)
List - II
(agent)
(i) Ni2+(A) Sodium thiosulphate
(ii) Ag+(B) Sodium nitroprusside
(iii) Cu2+(C) Ammonia
(iv) S2−(D) Dimethylglyoxime

A
CADB
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B
DCAB
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C
DCBA
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D
DACB
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Solution

The correct option is C DACB
Ni2+ ion forms a complex with DMG (dimethyl glyoxime) to form a complex which has a cherry-red precipitate

Ni2++2DMG+2OH−−−−2H2O[Ni(DMG)2]Cherryredprecipitate.

Ag+ ion reacts with sodium thiosulfate to form a complex Na3[Ag(S2O3)2]

Ag++2Na2S2O3Na3[Ag(S2O3)2]+Na+

Cu2+ ions react with ammonia to form a deep blue complex

Cu2++4NH3[Cu(NH3)4]2+deepblue

S2 reacts with Sodium nitroprusside (Na2[Fe(CN)5NO]) to form a complex [Fe(CN)5NOS]4

This results in deep violet coloration and is used as a test for the detection of sulfides.

S2+Na2[Fe(CN)5NO][Fe(CN)5NOS]4+2Na+

Thus the correct answer is option D.

1765799_146598_ans_f0840217657d4b98bf7daf0415a79946.png

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