Question

Aqueous solution of $Ni^{2 +}$ contains $\left[ Ni \left( H _{2} O \right)_{6}\right]^{2+}$ and its magnetic moment is 2.83 BM. When ammonia is added in it, comment on the magnetic moment of solution

• A. It will remain same
• B. It increases from 2.83 BM
• C. It decreases from 2.83 BM
• D. It cannot be predicted theoretically

Answer 1

Answer: (A)

On adding ammonia in aqueous solution of $Ni^{2 +}$ containing $\left[ Ni \left( H _{2} O \right)_{6}\right]^{2+}$ a new complex is formed as follows



As there is no change in hybridisation and number of unpaired electrons so magnetic moment remains same.