Importance of Co-Ordination Compounds (in Qualitative Analysis, Extraction of Metals and in Biological Systems) NEET Questions

Inorganic Chemistry - Coordination Compounds

Importance of Co-Ordination Compounds (in Qualitative Analysis, Extraction of Metals and in Biological Systems) MCQ Questions


13.
The selective estimation of Ca²⁺ and Mg²⁺ ions in EDTA titration is possible due to:
A.
Different stability constants of their EDTA complexes
B.
Different oxidation states of Ca and Mg
C.
Different colours of their EDTA complexes
D.
Different molecular weights
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ANSWER :
A. Different stability constants of their EDTA complexes
14.
In the extraction of gold by the cyanide process, the coordination entity formed in the leaching step is:
A.
[Au(CN)₄]⁻
B.
[Au(CN)₂]³⁻
C.
[Au(CN)₆]³⁻
D.
[Au(CN)₂]⁻
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ANSWER :
D. [Au(CN)₂]⁻
15.
In the cyanide process for extraction of gold, gold is recovered from [Au(CN)₂]⁻ solution by addition of:
A.
Mercury
B.
Zinc
C.
Iron
D.
Copper
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ANSWER :
B. Zinc
16.
In the Mond process, the purification of nickel is achieved through formation and decomposition of:
A.
[Ni(CO)₄]
B.
[NiCl₄]²⁻
C.
[Ni(CN)₄]²⁻
D.
[Ni(NH₃)₆]²⁺
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ANSWER :
A. [Ni(CO)₄]
17.
Silver is extracted from its argentite ore by treating with NaCN solution in presence of air. The coordination entity formed is:
A.
[Ag(NH₃)₂]⁺
B.
[Ag(CN)₂]⁻
C.
[Ag(CN)₄]³⁻
D.
[Ag(S₂O₃)₂]³⁻
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ANSWER :
B. [Ag(CN)₂]⁻
18.
The coordination compound used in the extraction of gold and silver from their ores involves which ligand?
A.
S₂O₃²⁻
B.
NH₃
C.
OH⁻
D.
CN⁻
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ANSWER :
D. CN⁻