A) \[Ti{{O}_{2}},T{{i}^{+4}}\]
B) \[VO,\,{{V}^{+4}}\]
C) \[V{{O}_{2}},\,{{V}^{+5}}\]
D) \[C{{u}_{2}}O,C{{u}^{+2}}\]
Correct Answer: D
Solution :
Copper (I) compounds are unstable in aqueous solution and undergo disproportionation. \[2C{{u}^{+}}\to C{{u}^{2+}}+Cu\] The greater stability of \[Cu_{(aq.)}^{2+}\]than\[Cu_{(aq.)}^{+}\]is due to much more \[-ve\,{{\Delta }_{hyd}}H\] of \[Cu_{(aq.)}^{2+}\]than\[Cu_{(aq.)}^{+},\]which more than compensates for the second ionization enthalpy of\[Cu\].
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