AIEEE 2006 Mock Test

Which one of the following sets of ions represents a collection of isoelectronic species?

The correct order of increasing acid strength of the compounds:(a) ${\text{CH}}_3{\text{CO}}_2\text{H}$ (b) ${\text{MeOCH}}_2{\text{CO}}_2\text{H}$ (c) ${\text{CF}}_3{\text{CO}}_2\text{H}$ (d) ${\text{Me}}_2{\text{CHCO}}_2\text{H}$ (Isopropyl acetic acid)

In which of the following molecules/ions are all the bonds not equal?

What products are expected from the disproportionation reaction of hypochlorous acid ($\text{HOCl}$)?

Nickel ($Z=28$) combines with a uninegative monodentate ligand ${\text{X}}^{-}$ to form a paramagnetic complex $[{\text{NiX}}_4{]}^{2-}$. The number of unpaired electron(s) in the nickel and geometry of this complex ion are, respectively: