Q.

Correct match of column I and column II is 

Column – IColumn - II
(I) Iso electronic(A)  84212Po and  82208Pb
(II) Isotopes(B)  82206Pb  and   83207Bi
(III) Isotones(C)  511B and  714N
(IV) Isobars(D)  11H and  12D
 (E)  1840Ar and  2040Ca

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a

I – E, II – C, III – B, IV – D

b

I – D, II – D, III – B, IV – E

c

I – D, II – D, III – E, IV – B

d

I – D, II – C, III – B, IV - E

answer is A.

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Detailed Solution

Iso electronic  Same number of electron  11H and  12D

Isotopes  Same atomic number but different mass number  11H and  12D

Isotones  Same neutron number but different proton number  82206Pb  and  83207Bi

Isobars  Same mass number but different atomic number  1840Ar and  2040Ca

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Correct match of column I and column II is Column – IColumn - II(I) Iso electronic(A)  84212Po and  82208Pb(II) Isotopes(B)  82206Pb  and   83207Bi(III) Isotones(C)  511B and  714N(IV) Isobars(D)  11H and  12D (E)  1840Ar and  2040Ca