Question

Which of the following is incorrect regarding the solutions of alkali in liquid `NH_(3)` ?
A. As the concentration increases above 3 M, the color of solution changes from dark blue to copper-bronze.
B. Blue colored solutions as well as bronze-colored solutions are paramagnetic.
C. These solutions conduct electricity better than any salt in any liquid and the conductivity is similar to that of pure metals.
D. These solutions act as powerful reducing agents for the elements of groups 14, 15, and 16 for many compounds and coordination complexes. They even reduce an aromatic ring.

Answer 1

Correct Answer - B
Blue colored dilute solutions are paramagnetic due to the presence of a large number of unpaired ammoniated electrons buit copper-bronze colored solutions are diamagnetic due to the formation of electron clusters in which ammoniated electrons with opposite spins join together
`2e^(-)(NH_(3))to[uarr e^(-) (NH_(3))_(x)][darr e^(-) (NH_(3))_(y)]`