1

IIT-JEE 1993

MCQ (Single Correct Answer)
Pick out the isoelectronic structures from the following
I. $$CH_3^+$$
II. $$H_3O^+$$
III. $$NH_3$$
IV. $$CH_3^-$$
A
I and II
B
III and IV
C
I and III
D
II, III and IV
2

IIT-JEE 1992

MCQ (Single Correct Answer)
The type of hybrid orbitals used by the chlorine atom in $$ClO_2^-$$ is
A
sp3
B
sp2
C
sp
D
none of these
3

IIT-JEE 1992

MCQ (Single Correct Answer)
The cyanide ion, CN- and N2 are isoelectronic, But in contrast to CN-, N2 is chemically inert, because of
A
low bond energy
B
absence of bond polarity
C
unsymmetrical electron distribution
D
presence of more number of electrons in bonding orbitals
4

IIT-JEE 1992

MCQ (Single Correct Answer)
The maximum number of hydrogen bonds a water molecule can form is
A
2
B
4
C
3
D
1

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