Coordination Compounds

The presence of Ni2+ion is detected by adding ____ in presence of ammonium hydroxide.

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The presence of Ni2+ ion is detected by adding dimethyl glyoxime in the presence of ammonium hydroxide to the salt solution. A brilliant red precipitate is formed due to the formation of a complex of Ni2+.

The chelating ligands which are used to remove excess of copper and iron are ____ .

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There is growing interest in the use of chelate therapy. A common example is the treatment of problems caused by the presence of metals in toxic proportions in animal and plant systems. The excess of iron and copper are removed by chelating ligands D-penicillamine and desferrioxime-B, through the formation of coordination compounds.

The number of ions produced from [Co(NH3)6]Cl3 in solution is

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The complex [Co(NH3)6]Cl3 ionises as[Co(NH3)6]3+ + 3 Cl-. So, there are four ions per molecule of the complex.

The wavelength of [Ti(H2O)6]3+ is ____ .

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The wavelength of [Ti(H2O)6]3is 510 nm.

In the extraction of gold, the gold metal is dissolved in ____ solution in the presence of atmospheric oxygen to form a soluble cyanide complex.

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The cyanide process used for the extraction of gold is based on the fact that gold dissolves in KCN solution, in the presence of atmospheric oxygen to form a soluble cyanide complex as follows: 4 Au + 8 KCN + 2 H2O + O (air) ------------------4 K [Au(CN)2] + 4 KOH.

The metal ion found in the gemstone topaz is ____ .

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The metal ion found in the gemstone topaz is Fe3+. The colours of many families of gemstones are due to the presence of transition metal ions. In these, the colours are produced due to electronic transitions within the d-orbitals of the transition metal ion.

CN- is a strong field ligand because ____.

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CN- is a strong field ligand because it can accept electrons from metal species.

Which is not the rule of naming the coordination compound?

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In naming ionic complexes, the cationic part is named first and then the anionic part. All the other options obey the rules for naming the coordination compounds.

The mode of ionisation of PtCl4.3NH3 is

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The mode of ionisation of PtCl4.3NH3 is [PtCl3(NH3)3]+ Cl- .The mode of ionisation helps us to predict the number of ions per mole of the complexes in the solution.

The compounds [CoBr(NH3)5] SO4 and [CoSO4(NH3)5]Br are ____.

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The compounds [CoBr(NH3)5] SO4 and [CoSO4(NH3)5]Br have same molecular formula but give different ions in solution. So these are ionisation isomers.

The colour of the complex [Co(NH3)6]3+ 3Cl- is

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The colour of the complex [Co(NH3)6]3+ 3Cl- is yellow as the solution conductivity corresponds to 1 : 3 electrolyte.

If the ligand happens to be multidentate and cyclic without steric effects, then the stability of the complex is ____.

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If the ligand happens to be multidentate and cyclic without steric effects, then the stability of the complex is increased. The effect is called macrocyclic effect.

The formula for tris(ethane-1,2-diamine)cobalt (III) ion is

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The name of the ligand includes the prefix when three ligands exist. Thus, The formula for tris(ethane-1,2-diamine)cobalt (III) ion is [Co(en)3]3+.

When aqueous ammonia is added to green solution of nickel chloride, the colour

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When aqueous ammonia is added to green solution of nickel chloride, the colour changes to purple. The Ni2+ ions almost disappear from the solution. The solution on evaporation, gives purple crystals corresponding to the formula [Ni(NH3)6]Cl2. NiCl2 + 6NH3 ------------ [Ni(NH3)6]Cl2.

A pair of enantiomorphs is given by ____.

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[Co(en)2Cl2]Cl shows optical isomerism for its cis-isomer, it will form a pair of enantiomorphs.

The name given to ONO- ligand is

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The name given to ONO- is nitrito-O. Since it is a negative ligand, it must end with -o, according to the rules for naming the coordination compound.

The Ziegler-Natta catalyst is a solution of ____.

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The Ziegler-Natta catalyst is a solution of TiCl4 and trialkyl aluminium. It is a heterogenous catalyst. It is used as a catalyst for polymerisation of olefins.

Which is not a complex compound?

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Ferrous ammonium sulphate is not a complex compound. The formula for ferrous ammonium sulphate is FeSO4.(NH4)2SO4.6H2Owhich is a double salt, as it contains two simple salts.

Taking H2O as a weak field ligand, the number of unpaired electrons in [Mn(H2O)6]2+ will be ____. (Atomic No. of Mn = 25)

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In the weak ligands field of water, there will be no pairing of electrons. Mn2+ has 3d5 which will have five unpaired electrons.

The complex compound used in cancer therapy is ____ .

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The platinum complex [PtCl2(NH3)2] known as cis-platin is used in cancer therapy.

EDTA is

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EDTA is ethylenediaminetetraacetate.

The mode of ionisation and total number of ions in solution formed by [PtCl4.(NH3)2] are

Correct! Wrong!

The no. of ions per mole of the complexes in the solution can be predicted from their modes of ionisation. In the complex, all chloride ions are non-ionisable and will not be precipitated by the addition of silver nitrate. Therefore, the coordination compound behaves as a neutral non-conducting molecule. Thus, the complex does not ionise and so the total no. of ions in solution is zero.

The coordination number of central metal ion in [Fe(C2O4)3]3- is

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The oxalate ion in the complex is bidentate ligand, so one bidentate ligand should be counted as two ligands. Thus, the three bidentate ligands make the coordination number 6 for [Fe(C2O4)3]3-.

The central metal atom in carboxypeptidase - A is ____ .

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The central metal atom in carboxypeptidase - A is zinc. It is a biological catalyst.

The reaction that takes place in photography is given by ____.

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The developed film is fixed by washing with hypo solution. This dissolves the undecomposed AgBr to form a complex. AgBr + Na2S2O3 --------------Na3 [Ag(S2O3)2] + NaBr.

The formula for potash alum is

Please select 2 correct answers

Correct! Wrong!

The formula of potash alum is K2SO4.Al2(SO4)3.24H2O. It is a double salt formed by reaction between Potassium sulphate and aluminium sulphate.

The isomerism which occurs in compounds containing ambidentate ligand is____.

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Compounds containing ambidentate ligands are those where more than one atom in a unidentate ligand may function as a donor. In such compounds, the isomerism is a linkage isomerism.

The number of ions per mole of PtCl4. 5NH3 present in the solution is

Correct! Wrong!

The no. of ions per mole of the complexes in the solution can be predicted from their modes of ionisation. The species in the co-ordination sphere do not ionize. So, the complex PtCl4. 5NH3 can be represented as [PtCl(NH3)5] Cl3 . The mode of ionisation is [PtCl(NH3)5]3+ + 3Cl- = 4 ions.

The Irving-Williams order is ____.

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It has been observed by Irving and Williams that irrespective of the nature of the ligand, the stability of the divalent ions of the 1st transition series is in the order Mn (II) < Fe (II) < Co(II) < Ni (II). This order is called Irving-Williams order.

The Wilkinson catalyst is ____ .

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The Wilkinson catalyst is [RhCl(Ph3P)] which is used for selective hydrogenation. It is of importance in pharmaceutical industry.

Class 12th Chemistry - 9 Coordination Compounds MCQs
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Class 12th Chemistry - 9 Coordination Compounds MCQs