A) \[T{{i}^{+}},\]\[T{{i}^{3+}}\]
B) \[C{{u}^{+}},\]\[C{{u}^{2+}}\]
C) \[C{{r}^{2+}},\]\[C{{r}^{3+}}\]
D) \[{{V}^{2+}},\]\[V{{O}^{2+}}\]
Correct Answer: A
Solution :
[a] As we move down in groups 13, 14 and 15, inertness of n \[{{s}^{2}}\] electrons of valence shell increases (inert pair effect). Thus in metals present at the bottom of the groups 13, 14, and 15 lower oxidation state becomes more important, viz. Pb (+2 state rather +4), Bi (+3 state rather +5) and Ti (+1 rather than +3).
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