Chemistry MCQs for NEET — Practice Questions with Answers

Grignard reagent is a $\mathrm{\sigma }$ complex

In ferrocene (Fe(C5H5)2), the iron atom is sandwiched between two cyclopentadienyl (C5H5-) rings. Each cyclopentadienyl ring acts as a bidentate ligand, contributing two electrons to the iron atom. Therefore, the coordination number of iron in ferrocene is 10.

In [Fe(H₂O)₆]³⁺, unpaired electrons are present while in [Fe(CN)₆]^3-, only one unpaired electron is present.

The structure of complex is[Co(en)₂Cl₂]Cl So, 1 mole of complex gives 1 mole of AgCl

Mole of Complex=0.1$\times$0.024=0.0024

Mole of AgCl formed=0.0024

Ambidentate ligands are monodentate ligands that have can bind in two possible places. For example, the nitrate ion NO₂^- can bind to the central metal atom/ion at either the nitrogen atom or one of the oxygen atoms. The thiocyanate ion, SCN^- can bind to the central metal at either the sulfur or the nitrogen.

 [Cr(en)₂Br₂]⁺ can show optical as well as geometrical isomerism

The number of hydrate isomers of CoCl3.6H2O are. These are

a) [Co(H₂O)₆]Cl₃

b) [Co(H₂O)₅Cl]Cl₂.H₂O

c) [Co(H₂O)₄Cl₂]Cl.2H₂O

The hybridised state of copper is dsp² and it has 1 unpaired electron.

 ${\mathrm{K}}_4\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right] \stackrel{ }{\to }4{\mathrm{K}}^{+} + {\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}^{4-}$