The isostere pair is

1. CO₂ and N₂O

2. CO and N₂

3. O₂ and NO₂

4. Both (1) and (2)

Select the correct order of solubility (in water) from the following:

1. SrSO₄ < CaSO₄ < MgSO₄ < BeSO₄

2. NaF < KF < RbF < CsF

3. Ba(OH)₂ > Sr(OH)₂ > Ca(OH)₂ > Mg(OH)₂

4 All of the above

Which of the following molecules exhibits H-bonding?

The hydride of group 16 having highest boiling point is:

1. H₂O because of H-bonding

2. H₂Te because of higher molecular weight

3. H₂S because of H-bonding

4. H₂Se because of lower molecular weight

Compound that is isoelectronic with an adduct of "Diborane and Ammonia" is:

1. Hydrogen peroxide.

2. Diborane (at absolute zero temp.).

3. First member of alkyne series.

4. Diborane (at 10$°$C temp).

Which of the following has largest bond angle.

1. H₂O

2. F₂O

3. Cl₂O

4. H₂S

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