The colour and magnetic nature of manganate ion (MnO42-) is from

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 Multiple Choice QuestionsMultiple Choice Questions

91.

Which of the following species shows the maximum magnetic moment?

  • Mn6+

  • Ni2+

  • Fe3+

  • Ag+


92.

C-H bond length is least in

  • acetylene

  • methane

  • ethylene

  • ethane


93.

[Cu(NH3)4]2+ shows the following hybridization

  • dsp2

  • sp3d

  • dsp3

  • sp3


94.

What is the geometry of molecule of bromine penta fluoride?

  • Square planar

  • Trigonal bipyramidal

  • Squre pyramidal

  • Octahedral


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95.

Bond order of which among the following molecules is zero?

  • F2

  • O2

  • Be2

  • Li2


96.

Select a ferromagnetic material from the following.

  • Dioxygen

  • Chromium (IV) oxide

  • Benzene

  • Dihydrogen monoxide


97.

Which element among the following does form pπ - pπ multiple bonds?

  • Arsenic

  • Nitrogen

  • Phosphorus

  • Antimony


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98.

The colour and magnetic nature of manganate ion (MnO42-) is

  • green, paramagnetic

  • purple, diamagnetic

  • green, diamagnetic

  • purple, paramagnetic


A.

green, paramagnetic

Oxidation state of Mn in MnO42- is +6.

Mn(+6) = 1s2 2s2 2p6 ,3s2 3p6 3d1, 4s0

Hence, manganate ion is paramagnetic due to presence of unpaired electron. Also, it is green in colour.


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99.

What is the hybridisation of carbon atoms in fullerene?

  • sp3

  • sp

  • sp2

  • dsp3


100.

Among the following, the molecule that will have the highest dipole movement is

  • H2

  • HF

  • HBr

  • HCl


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