MCQ
Which of the following complexes show six coordination number
- A${[Zn{(CN)_4}]^{2 - }}$
- ✓${[Cr{({H_2}O)_6}]^{3 + }}$
- C${[Cu{(CN)_4}]^{2 - }}$
- D${[Ni{(N{H_3})_4}]^{2 + }}$
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$(A)$ It behaves as a weak acid in water due to self ionization.
$(B)$ Acidity of its aqueous solution increases upon addition of ethylene glycol.
$(C)$ It has a three dimensional structure due to hydrogen bonding.
$(D)$ It is weak electrolyte in water.

Assertion $A$ : Energy of $2 s$ orbital of hydrogen atom is greater than that of $2\,s$ orbital of lithium.
Reason $R$ : Energies of the orbitals in the same subshell decrease with increase in the atomic number.
In the light of the above statements, choose the correct answer from the options given below.