Describe three important applications of coordination compounds, one each in (a) qualitative/quantitative anal

Exercise · Q36

Q. Describe three important applications of coordination compounds, one each in

(a) qualitative/quantitative analysis,

(b) extraction of a metal, and

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(a) Qualitative/quantitative analysis: metal ions are identified and measured through characteristic complex formation — $\text{Ni}^{2+}$ forms a bright red precipitate with dimethylglyoxime, and $\text{Fe}^{3+}$ forms a blood-red complex with thiocyanate, both used as sensitive qualitative tests; quantitatively, the hexadentate ligand EDTA forms a stable 1:1 chelate with $\text{Ca}^{2+}$ and $\text{Mg}^{2+}$ , and titrating a water sample against a standard EDTA solution (complexometric titration) is the standard method for determining water hardness. (b) Extraction of a metal: gold and silver are extracted from low-grade ore by the Mac Arthur-Forrest cyanide process, in which the metal is oxidized and dissolved as a soluble cyanide complex ion, $4\text{Au} + 8\text{CN}^- + \text{O}_2 + 2\text{H}_2\text{O} \to 4[\text{Au}(\text{CN})_2]^- + 4\text{OH}^-$ , and then recovered by displacement with more reactive zinc metal, $2[\text{Au}(\text{CN})_2]^- + \text{Zn} \to [\text{Zn}(\text{CN})_4]^{2-} + 2\text{Au}$ — without complex formation, gold could not be selectively dissolved out of the crushed ore at all. (c) Biological system: haemoglobin, the oxygen-carrying protein of red blood cells, is an iron(II)-porphyrin coordination compound (the haem group) whose iron centre reversibly binds one molecule of $\text …

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Same / Similar Concept — real previous-year questions on the same or a closely similar concept, not this exact question.

CBSE 2024Set D1 markMCQ
$Q. Vitamin B12 contains$
(a) Cobalt
(b) Magnesium
(c) Iron
(d) Nickel
›Reveal solutionSolution
Vitamin B12 (cyanocobalamin) contains a central cobalt ion in a corrin ring — a biologically important coordination compound.

Several biomolecules are metal complexes:

Chlorophyll contains magnesium.

Haemoglobin contains iron. …
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CBSE 2023Set ANNUAL1 mark
$Q. Write the name of platinum complex used in the treatment of cancer.$
›Reveal solutionSolution

Cisplatin, cis-diamminedichloridoplatinum(II), is a widely used platinum-based anticancer coordination complex.

Cisplatin, cis-diamminedichloridoplatinum(II), $cis$ - $[PtCl_2(NH_3)_2]$ , is a square planar platinum coordination complex used extensively in chemotherapy for the treatment of various cancers (e.g. testicular, ova …

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CBSE 2021Set A1 markMCQ
$Q. Which of the following has magnesium?$
(a) Chlorophyll
(b) Haemocyanin
(c) Carbonic anhydrase
(d) Vitamin B12
›Reveal solutionSolution
Chlorophyll contains magnesium; the others contain Cu, Zn or Co.

Many biologically important molecules are metal complexes:

(A) Chlorophyll — contains Mg2+ at the centre of a porphyrin ring; essential for photosynthesis.

(B) Haemocyanin — a copper(Cu)-containing oxygen carrier in some invertebrates. …
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CBSE 2019Set ANNUAL1 mark
$Q. What is Nessler’s reagent?$
›Reveal solutionSolution

Nessler's reagent, $K_2[HgI_4]$ in KOH, gives a brown precipitate/colouration with ammonia — a classic coordination-complex-based analytical test.

Nessler's reagent is prepared by dissolving mercury(II) chloride and potassium iodide in excess KI (forming the tetraiodomercurate(II) complex ion $[HgI_4]^{2-}$ ) and making the solution strongly alkaline with KOH. When treated with a trace of ammonia or ammonium salt, it produces a characteristic yellow-to-brown colouration or precipitate (an iodide of Millon's base, $[Hg_2N]I\cdot H_2O$ -type spe …

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CBSE 2017Set ANNUAL1 markMCQ
$Fe^{2+}$
(a) $[Fe(CO)_5NO]^{2+}$
(b) $[Fe(NH_3)_5NO]^{2+}$
(c) $[Fe(CH_3NH_2)_5NO]^{2+}$
(d) $[Fe(H_2O)_5NO]^{2+}$
›Reveal solutionSolution

The brown-ring test's coloured species is the nitrosyl complex $[Fe(H_2O)_5NO]^{2+}$ .

In the 'brown ring' test for nitrate ion, dilute $NO_3^-$ solution is treated with freshly prepared $FeSO_4$ and then conc. $H_2SO_4$ is added carefully along the side of the tube. The acid reduces nitrate to nitric oxide, $NO_3^- + 3Fe^{2+} + 4H^+ \rightarrow NO + 3Fe^{3+} + 2H_2O$ , and the $NO$ formed combines with an unreacted $Fe^{2+}$ ion (which already carries five aqua liga …

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CBSE 2017Set ANNUAL1 markMCQ
$Q. Cisplatin compound is used in the treatment of _______.$
(a) malaria
(b) cancer
(c) AIDS
(d) yellow fever
›Reveal solutionSolution

Cisplatin, $cis$ - $[Pt(NH_3)_2Cl_2]$ , is a platinum coordination-compound chemotherapy drug.

Cisplatin, $cis$ -diamminedichloridoplatinum(II), $cis$ - $[Pt(NH_3)_2Cl_2]$ , is a square-planar coordination compound of platinum(II) used as an anticancer (chemotherapy) drug — it works by binding to DNA in cancer cells an …

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Q.Describe three important applications of coordination compounds, one each in

Concept understanding — Applications of Coordination Compounds

Applications of Coordination Compounds

Q.Describe three important applications of coordination compounds, one each in

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