Which of the following pairs share both isoelectronicity and isostructural characteristics?

${\mathrm{NO}}_3^{-}, {\mathrm{CO}}_3^{-2}, {\mathrm{ClO}}_3^{-}, {\mathrm{SO}}_3$

1. ${\mathrm{NO}}_3^{-}, {\mathrm{CO}}_3^{-2}$

2. ${\mathrm{SO}}_3, {\mathrm{NO}}_3^{-}$

3. ${\mathrm{ClO}}_3^{-}, {\mathrm{CO}}_3^{-2}$

4. ${\mathrm{CO}}_3^{-2}, {\mathrm{ClO}}_3^{-}$

Which of the following has largest bond angle.

1. H₂O

2. F₂O

3. Cl₂O

4. H₂S

In the molecular orbital diagram for ${\mathrm{O}}_2^{+}$ ion. the HOMO is :-

(1) $\sigma$ MO orbital

(2) π MO orbital

(3)  π^* MO orbital

(4) $\stackrel{*}{\sigma }$ MO orbital

The correct order of H-bond strength in the following compounds is:

1. H₂O > H₂O₂ > HF > H₂S

2. HF >  H₂O₂ > H₂O > H₂S

3. HF > H₂O > H₂S > H₂O₂

4. HF > H₂O > H₂O₂ > H₂S

 A pair of species that have identical shapes is : 

1. NO₂⁺ and NO₂^-

2. PCl₅ and BrF₅

3. XeF₄ and ICI₄^-

4. TeCl₄ and XeO₄

Which of the following is correct :-

(1) Extent of hydration is PCl₅ > SiCl₄ and BCl₃ < CCl₄

(2) K⁺ ion will be more Hydrated than Li⁺

(3) In BCl₃ there are no vacant d-orbitals but still it can undergo expansion

(4) None

Carbon atom in C₂(CN)₄ are

1. sp hybridised

2. sp² hybridised

3. sp and sp² hybridised

4. sp, sp² and sp³ hybridised

The correct order in which the O-O bond length increases in the following is

1. H₂O₂ < O₂ < O₃

2. O₃ < H₂O < O₂

3. O₂ < O₃< H₂O₂

4. O₂ < H₂O₂ < O₃

Carbon suboxide (C₃O₂) has

1. Linear structure

2. Bent structure

3. Trigonal structure

4. Disorted tetrahedral structure

Which of the following leads to bonding orbital?

1.		2.
3.		4.