Ligands, coordination number, denticity and chelation — NEET & JEE Questions

Question 1 · difficulty L1 · recall

A ligand is a species that forms a coordinate bond to a metal centre by

• A. donating an electron pair
• B. accepting a proton only
• C. donating a neutron pair
• D. removing all d electrons

Question 2 · difficulty L2 · understanding

The complex of $\mathrm{Ni}^{2+}$ ion and dimethyl glyoxime contains __________ number of Hydrogen (H) atoms.

Question 3 · difficulty L2 · understanding

Number of ambidentate ligands in a representative metal complex $$\left[\mathrm{M}(\mathrm{en})(\mathrm{SCN})_{4}\right]$$ is ___________. [en = ethylenediamine]

Question 4 · difficulty L2 · understanding

Sum of oxidation state (magnitude) and coordination number of cobalt in $$\mathrm{Na}\left[\mathrm{Co}(\mathrm{bpy}) \mathrm{Cl}_{4}\right]$$ is _________.

Question 5 · difficulty L2 · understanding

The conductivity of a solution of complex with formula $$\mathrm{CoCl}_{3}\left(\mathrm{NH}_{3}\right)_{4}$$ corresponds to 1 : 1 electrolyte, then the primary valency of central metal ion is __________.

Question 6 · difficulty L2 · understanding

In the cobalt-carbonyl complex : [Co 2 (CO) 8 ], number of Co-Co bonds is "X" and terminal CO ligands is "Y". X + Y = ___________.

Question 7 · difficulty L2 · understanding

The sum of oxidation states of two silver ions in [Ag(NH 3 ) 2 ] [Ag(CN) 2 ] complex is _____________.

Question 8 · difficulty L2 · understanding

The ratio of number of water molecules in Mohr's salt and potash alum is ____________ $$\times$$ 10 $$-$$1 . (Integer answer)

Question 9 · difficulty L2 · understanding

Three moles of AgCl get precipitated when one mole of an octahedral co-ordination compound with empirical formula CrCl 3 .3NH 3 .3H 2 O reacts with excess of silver nitrate. The number of chloride ions satisfying the secondary valency of the metal ion is ______________.

Question 10 · difficulty L2 · understanding

The total number of unpaired electrons present in the complex K 3 [Cr(oxalate) 3 ] is _____________.