Assertion : Potassium ferrocyanide is diamagnetic whereas potassi

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 Multiple Choice QuestionsMultiple Choice Questions

571.

Among the following, the species having square planar geometry for central atom are
(i) XeF4, (ii) SF4, (iii) [NiCl4]2- ,(iv) [PdCl]2-

  • (i) and (iv)

  • (i) and (ii)

  • (ii) and (iii)

  • (iii) and (iv).


572.

Which of the following does not have a lone pair on the central atom ?

  • NH3

  • PH3

  • BF3

  • PCl3


573.

What is the nature of the bond between B and O in (C2H5)2OBH3 ?

  • Covalent

  • Co - ordinate covalent

  • Ionic bond

  • Banana shaped bond


574.

Among the following molecules

(i) X..eO3 (ii) X..eOF4 (iii) X..eF

those having same number of lone pairs on Xe are

  • (i) and (ii) only

  • (i) and (iii) only

  • (ii) and (iii) only

  • (i), (ii) and (iii)


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575.

The diamagnetic species is

  • [Ni(CN)4]2-

  • [NiCl4]2-

  • [CoCl4]2-

  • [CoF6]2-


576.

In diborane, the two H - B - H angles are nearly

  • 60°, 120°

  • 95°, 120°

  • 95°, 150°

  • 120°, 180°


577.

The bond order of O2+ is the same as in :

  • N2+

  • CN-

  • CO

  • NO+


578.

What type of hybridisation takes place in the N atom of NH3 ?

  • sp2

  • sp3

  • dsp2

  • sp


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579.

Assertion : Molecular nitrogen is less reactive than molecular oxygen.

Reason : The bond length of N2 is shorter than that of oxygen.

  • If both assertion and reason are true and reason is the correct explanation of the assertion.

  • If both assertion and reason are true but reason is not the correct explanation of the assertion.

  • If assertion is true, but reason is false.

  • Both assertion and reason are false statements.


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580.

Assertion : Potassium ferrocyanide is diamagnetic whereas potassium ferricyanide is paramagnetic.

Reason : Crystal field splitting in ferrocyanide ion is greater than that of ferricyanide ion.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


C.

If assertion is true but reason is false.

In ferrocyanide ion, the oxidation state of Fe is +2 however in ferricyanide ion, the oxidation number of Fe is +3.

Generally, the higher the oxidation state of the metal, the greater the crystal field splitting. It means crystal field splitting in ferrocyanide ion is lower than that of ferricyanide ion.

Ferrocyanide ion or [Fe(CN)6]4- is dimagnetic-

Ferricyanide ion or [Fe(CN)6]3- is paramagnetic-


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