(a) Following are the transition metal ions of 3d series:
$T i^{4 +}, V^{2 +}, M n^{3 +}, C r^{3 +}$
(Atomic numbers : Ti = 22, V = 23, Mn = 25, Cr = 24)
Answer the following:
(i) Which ion is most stable in an aqueous solution and why?
(ii) Which ion is a strong oxidising agent and why?
(iii) Which ion is colourless and why?
(b) Complete the following equations:
$(i) 2 M n O_{4}^{-} + 16 H^{+} + 5 S^{2 -} \to (i i) K M n O_{4} H e a t - -- \to$

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Solution

(a) (i) $C r^{3 +}$ is most stable, because stabililty depends on electrode potential due to the small size, $C r^{3 +}$ is most stable.

(ii) $M n^{3 +}$ because of its half filled configuration.

(iii) $T i^{4 +},$ because of its d $^{\circ}$ configuration of the ion.

(b) $(i) 2 M n O_{4}^{-} + 16 H^{+} + 5 S^{2 -} ⟶ 2 M n^{2 +} + 8 H_{2} O + 5 S (i i) K M n O_{4} H e a t - -- \to K_{2} M n O_{4} + M n O_{2} + O_{2} ↑$

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Similar questions

T i^{4 +}, V^{2 +}, M n^{3 +}, C r^{3 +}

(i) 2 M n O_{4}^{-} + 16 H^{+} + 5 S^{2 -} \to (i i) K M n O_{4} H e a t - -- \to

3 d

T i^{4 +}, V^{2 +}, M n^{3 +}, C r^{3 +}

T i = 22, V = 23, M n = 25, C r = 24)

Which one of the following ions is the most stable in aqueous solution?
(Atomic number. Ti = 22, V = 23, Cr = 24, Mn = 25)

T i = 22, V = 23, C r = 24, M n = 25

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