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JEEMAIN and NEET
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JEEMAIN PAST PAPERS
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2005
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Q)
Of the following sets which one does not contain isoelectronic species ?
( A )
S
O
2
−
3
,
C
O
2
−
3
,
N
O
−
3
( B )
B
O
3
−
3
,
C
O
2
−
3
,
N
O
−
3
( C )
P
O
3
−
4
,
S
O
2
−
4
,
C
l
O
−
4
( D )
C
N
−
,
N
2
,
C
2
−
2
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