91.

Which of the following species shows the maximum magnetic moment?

• Mn⁶⁺

• Ni²⁺

• Fe³⁺

• Ag⁺

C-H bond length is least in

• acetylene

• methane

• ethylene

• ethane

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

• dsp²

• sp³d

• dsp³

• sp³

What is the geometry of molecule of bromine penta fluoride?

• Square planar

• Trigonal bipyramidal

• Squre pyramidal

• Octahedral

Bond order of which among the following molecules is zero?

• F₂

• O₂

• Be₂

• Li₂

Select a ferromagnetic material from the following.

• Dioxygen

• Chromium (IV) oxide

• Benzene

• Dihydrogen monoxide

Which element among the following does form p$\mathrm{\pi }$ - p$\mathrm{\pi }$ multiple bonds?

• Arsenic

• Nitrogen

• Phosphorus

• Antimony

The colour and magnetic nature of manganate ion (MnO${}_4^{2-}$) is

• green, paramagnetic

• purple, diamagnetic

• green, diamagnetic

• purple, paramagnetic

What is the hybridisation of carbon atoms in fullerene?

• sp³

• sp

• sp²

• dsp³

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

• H₂

• HF

• HBr

• HCl