Question

Consider the following statements and arrange in the order of true/false as given in the codes.
S${}_1$ : Mn${}^{2+}$ compounds more stable than Fe${}^{2+}$ towards oxidation to their +3 states.
S${}_2$ : Titanium and copper both in the first series of transition metals exhibits +1 oxidation state most frequently.
S${}_3$ : Cu${}^{+}$ ion is stable in aqueous solution.

• A. T T F
• B. T F F
• C. T F T
• D. F F T

Answer 1

The correct option is B T F F

Mn${}^{2+}$ compounds more stable than Fe${}^{2+}$ towards oxidation to their +3 states because Mn${}^{2+}$ has 3d${}^5$ configuration which has extra stability(half filled configuration).
Not titanium but Copper exhibits +1 oxidation state most frequently, because with +1 oxidation state an extra stable configuration, 3d${}^{10}$ (full filled configuration).
Cu${}^{+}$ ion is unstable as it undergoes disproportionation $2C{u}^{+}\left(aq\right)\to C{u}^{2+}\left(aq\right)+Cu\left(s\right)$. The E${}^0$ value for this is favourable.