The correct order of the increasing bond angles in the following triatomic species is : 

1. ${\mathrm{NO}}_2^{-}$< ${\mathrm{NO}}_2^{+}$ < NO₂

2. ${\mathrm{NO}}_2^{-}$ < NO₂ < ${\mathrm{NO}}_2^{+}$

3. ${\mathrm{NO}}_2^{+}$  < NO₂ < ${\mathrm{NO}}_2^{-}$

4. ${\mathrm{NO}}_2^{+}$ < ${\mathrm{NO}}_2^{-}$ < NO₂

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. $d_{xy}, d_{yz}$

Equilateral shape has

1. sp hybridisation

2. sp² hybridisation

3. sp³ hybridisation

4. dsp² hybridisation

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. $d_{z^2}, s, p_x, p_y, p_z$

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

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  

Compound that does not exhibit hydrogen bonding is-

1. ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}$

2.  

3. 

4.  

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

1. XeF₂

2. H₃O⁺

3. XeF₄

4. XeF₆

Which is the least polarizable gas among the following?

1. He

2. Ne

3. Kr

4. Xe