Question

Aqueous solution of $N{i}^{2+}$ 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 $N{i}^{2+}$ 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.