Which of the following ions forms most stable complex compound?

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101.

Which of the following ions forms most stable complex compound?

  • Cu2+

  • Ni2+

  • Fe2+

  • Mn2+


A.

Cu2+

The transition elements form complexes because of the following reasons-

(i) They have small size.

(ii) They have large effective nuclear charge.

(iii) They have vacant d-orbitals so that these orbitals can accept lone pairs of electrons donated by the ligands. 

Cu2+ has smallest size and highest nuclear charge among the given species. Hence, it forms the most stable complex compound.


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102.

Pb2+, Cu2+, Zn2+ and Ni2+ ions are present in a given acidic solution. On passing hydrogen sulphide gas through this solution the available precipitate will contain

  • PbS and NiS

  • PbS and CuS

  • CuS and ZnS

  • CuS and NiS


103.

To an acid solution of an anion a few drops of KMnO4 solution are added. Which of the following, if present will not decolourise the KMnO4 soltuion?

  • NO2-

  • S2-

  • Cl-

  • CO32-


104.

AgNO3 gives red colour with

  • NaCl

  • NaBr

  • NaI

  • K2CrO4


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105.

Calomel is

  • Hg2Cl2

  • Hg + Hg2Cl2


106.

Which of the following complex neutralises three molecules of AgNO3?

  • [Co(NH3)6]Cl3

  • [Co(NH3)5Cl]Cl2

  • [Co(NH3)4Cl2]Cl

  • [Co(NH3)3Cl3]


107.

Elements which generally exhibit multiple oxidation states and whose ions are usually coloured are

  • metalloids

  • non- metals

  • tranistion elements

  • gases


108.

The transition metals mostly are

  • diamagnetic

  • paramagentic

  • neither diamagnetic nor paramagnetic

  • both diamagnetic and paramagnetic.


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109.

The correct statement in respect of d-block elements is

  • they are all metals

  • they show variable valency

  • they form coloured ions and complex salts

  • All the above statements are correct


110.

On reduction of KMnO4, by oxalic acid in acidic medium, the oxidation number of Mn changes. What is the magnitude of this change?

  • From 7 to 2

  • From 6 to 2

  • From 5 to 2

  • From 7 to 4


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