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Question

Select the correct statements(s)


A
For the same charge and the same size, a pseudo noble gas type cation with 18e in the outermost shell is more polarizing than the cation of noble gas type with 8e in the outermost shell
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B
The degree of covalency increases in descending a group in the transition metal ions for a particular oxidation state
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C
Size increases in descending a group in the transition metal ions for a particular oxidation state
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D
Covalency decreases in descending a group in the transition metal ions for a particular oxidation
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Solution

The correct options are
A For the same charge and the same size, a pseudo noble gas type cation with $$18\, e^-$$ in the outermost shell is more polarizing than the cation of noble gas type with $$8\, e^-$$ in the outermost shell
B The degree of covalency increases in descending a group in the transition metal ions for a particular oxidation state
(A) For the same charge and the same size, a pseudo noble gas type cation with $$18\, e^-$$ in the outermost shell is more polarizing than the cation of noble gas type with $$8\, e^-$$ in the outermost shell.
This is due to the improper shielding by inner d electrons. Hence, the option A is correct.
(B) The degree of covalency increases in descending a group in the transition metal ions for a particular oxidation state.
This is because nuclear charge increases but there is no significant increase in the size due to lanthanoid contraction. Hence, the option B is correct.
(C) Size does not significantly increases in descending a group in the transition metal ions for a particular oxidation state. This is due to the lanthanoid contraction. hence, the option C is correct.
(D) Covalency increases in descending a group in the transition metal ions for a particular oxidation
Hence, the option D is incorrect.

Chemistry

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