1
MCQ (Single Correct Answer)

AIPMT 2006

Which of the following species has a linear shape?
A
O3
B
NO2$$-$$
C
SO2
D
NO2+

Explanation

Due to sp hybridisation of N+, NO2+ ion has linear shape.
2
MCQ (Single Correct Answer)

AIPMT 2006

Which of the following is not isostructural with SiCl4 ?
A
NH4$$-$$
B
SCl4
C
SO42$$-$$
D
PO43$$-$$

Explanation

SiCl4, NH4+, SO42- and PO43- ions are the examples of molecules/ions which are of AB4 type and have tetrahedral structure. SCl4 is AB4(lone pair) types species. Although the arrangement of five sp3d hybrid orbitals in space is trigonal bipyramidal, due to the presense of one lone pair of electron in the basal hybrid orbital, the shape of AB4(lone pair) species gets distorted and becomes distorted tetrahedral or see-saw.
3
MCQ (Single Correct Answer)

AIPMT 2006

Which of the following is not a correct statement?
A
Multiple bonds are always shorter than corresponding single bonds.
B
The electron-deficient molecules can act as Lewis acids.
C
The canonical structures have no real existence.
D
Every AB5 molecule does in fact have square pyramid structure.

Explanation

AB5 molecule has generally trigonal bipyramidal structure. Sometimes due to presence of lone pair of electrons the structure gets distorted.
4
MCQ (Single Correct Answer)

AIPMT 2005

The correct sequence of increasing covalent character is represented by
A
LiCl < NaCl < BeCl2
B
BeCl2 < LiCl < NaCl
C
NaCl < LiCl < BeCl2
D
BeCl2 < NaCl < LiCl

Explanation

As difference of electronegativity increases % iconic charecter increases and covalent charecter decreases i.e, electronegativity difference decreases covalent charecter increases. Further greater the charge on the cation more will be its covalent character. Be has maximum (+2) charge.

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