MCQ
Select the correct statement about the given complex


- AIt has four ions in aqueous solution
- BPrimary valency of cobalt is six.
- ✓It give one mole of $AgCl$ ppt on reaction with excess of $AgNO_3$.
- DIt has one primary valency

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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.