Question:
in which of the following pairs of ions ,the lower oxidation states in aqueos solution is more stable than other? AND WHY?
(a) Ti+ , Ti2+
(b) Cu+ , Cu2+
(c) Cr2+ , Cr3+
(d)V2+ ,VO2+ (V4+)
Answer:
a) Ti2+, as it cannot be further oxidised by water. Ti+ is oxidised to form Ti2+.
b) Cu2+, Cu+ is oxidised to form Cu2+.
c) Cr3+, Cr2+ is oxidised to form Cr3+.
d) V4+, as it is most soluble in water and does not precipitate. Its 4 positive charges interacts (dipole-dipole interactions) maximally with water and gets stabilised.
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