Which is the least polarizable gas among the following?

1.	He	2.	Ne
3.	Kr	4.	Xe

Correct statement among the following regarding the shape of  HgCl₂, SnCl₂ and F₂O is:

Which of the following species has maximum number of lone-pair of electrons on the central atom ?

1. XeF₂

2. H₃O⁺

3. XeF₄

4. XeF₆

PCl₅ is highly unstable and in a solid-state, it exists as into  [PCl₄]⁺ and [PCl₆]^- ions.

The geometry of [PCl₆]^- is   

1. Octahedral

2. Tetrahedral

3. Square pyramidal

4. Square planar

Which of the following compounds does not exhibit hydrogen bonding?

1.	\(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}\)	2.
3.		4.

Which of the following statement is not correct from the view point of molecular orbital theory ?

1. Be₂ is not a stable molecule

2. He₂ is not a stable but He_2⁺ is expected to exist.

3. Bond strength of N₂ is maximum amongst the homonuclear diatomic molecules belonging to the second period.

4. The order of energies of molecular orbitals in N₂ molecule is

 s2s < s*2s < s2p_z < (p2p_x=p2p_y) < (p*2p_x=p*2p_y) < s*2p_z  

The types of hybrid orbitals of nitrogen in NO₂⁺, NO₃^- and NH₄⁺ respectively are expected to be

1. sp, sp³ and sp²

2. sp, sp² and sp³

3. sp², sp and sp³

4. sp², sp³ and sp

AsF₅ molecule is trigonal bipyramidal. The hybrid orbitals used by As-atoms for bonding are

1. $d_{x^2-y^2}, d_{z^2}, s, p_x, p_y$

2. $d_{xy}, s,p_x, p_y, p_z$

3. $s, p_x, p_y, p_z, d_{xy}$

4. $d_{z^2}, s, p_x, p_y, p_z$

Equilateral shape has

1. sp hybridisation

2. sp² hybridisation

3. sp³ hybridisation

4. dsp² hybridisation

In an octahedral structure, the pair of d orbitals involved in d²sp³-hybridisation is:

1. $d_{x^2-y^2}, d_{z^2}$

2. $d_{xy}, d_{x^2\mathit{-}{y}^{\mathit{2}}}$

3. $d_{{\mathrm{z}}^2}, d_{xz}$

4. $d_{xy}, d_{yz}$