| (i) \[L{{i}^{\oplus }},\] |
| (ii) \[M{{g}^{2+}},\] |
| (iii) \[A{{l}^{+3}},\] |
| (iv) \[C{{u}^{\oplus }},\] |
| (v) \[C{{d}^{2+}},\] |
| (vi) \[P{{t}^{4+}},\] |
| (vii) \[\overset{\bigcirc -}{\mathop{O}}\,H,\] |
| (viii) \[N{{O}_{3}}^{\bigcirc -},\] |
| (ix) \[C{{O}_{3}}^{2-},\] |
| (x) \[{{H}^{\bigcirc -}}\] |
| (xi) \[{{I}^{\bigcirc -}},\] |
| (xii) \[C{{N}^{\bigcirc -}},\] |
| The total numbers of hard acids and soft acids are, respectively, |
A) 3, 2
B) 3, 3
C) 4, 3
D) 4, 4
Correct Answer: B
Solution :
[b] Hard bases :
Hard acids : \[L{{i}^{\oplus }},\,M{{g}^{2+}},A{{l}^{+3}}]=3\] Soft bases : 
Soft acids: \[C{{u}^{\oplus }},C{{d}^{2+}},P{{t}^{4+}}]=3\]
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