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Question

Match list-I with list-II and select the correct answer using the codes given below -

List-I List-II

Ion Radius (in pm)

(I) Li+ (a) 216

(II) Na+ (b) 195

(III) Br− (c) 60

(IV) I− (d) 95


A

Ia,IIb,IIId,IVc

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B

ib,iic,iiia,ivd

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C

ic,iid,iiib,iva

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D

id,iic,iiib,iva

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Solution

The correct option is C

ic,iid,iiib,iva


I-c, II-d, III-b, IV-a

You don't actually need to remember the values.

First look at the number of shells. Whichever has the higher number would be larger.

If the number of shells is the same, you can then look for the effective nuclear charge.

Li+ would be smallest with 1 shell, then Na+ with 2 shells, Br with 4 shells and I with 5 shells.


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