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?

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 leads to bonding orbital?

1.		2.
3.		4.

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

${\mathrm{NO}}_3^{-},<mspace\; width="1em"></mspace>{\mathrm{CO}}_3^{-2},<mspace\; width="1em"></mspace>{\mathrm{ClO}}_3^{-},<mspace\; width="1em"></mspace>{\mathrm{SO}}_3$

1. ${\mathrm{NO}}_3^{-},<mspace\; width="1em"></mspace>{\mathrm{CO}}_3^{-2}$

2. ${\mathrm{SO}}_3,<mspace\; width="1em"></mspace>{\mathrm{NO}}_3^{-}$

3. ${\mathrm{ClO}}_3^{-},<mspace\; width="1em"></mspace>{\mathrm{CO}}_3^{-2}$

4. ${\mathrm{CO}}_3^{-2},<mspace\; width="1em"></mspace>{\mathrm{ClO}}_3^{-}$

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