Which molecule among the following is non-polar?

1.	SbCl5	2.	NO2
3.	POCl3	4.	CH2O

The structure of PCl₅ in the solid state is: 

1. Square pyramidal.
2. Tetrahedral [PCl₄]⁺ and octahedral [PCl₆]^–
3. Square planar [PCl₄] and octahedral [PCl₆]^–
4. Trigonal bipyramidal.

In which of the following pairs the two species are not isostructural?

1. PCl₄⁺ and SiCl₄

2. PF₅  and BrF₅

3. AlF₆³⁻ and SF₆

4. CO₃²⁻ and NO₃⁻

Among the following, the correct statements about ${\mathrm{CO}}_3^{2- }$

Choose the correct option :

Lattice energy for an ionic compound relies on:

Which of the compounds given below will exhibit a linear structure?

1. NO₂

2. HOCl

3. O₃

4. N₂O

The electronic configurations of the elements A, B, and C are given below.

$\mathrm{A} = 1{\mathrm{s}}^2 2{\mathrm{s}}^2 2{\mathrm{p}}^6$
$\mathrm{B} = 1{\mathrm{s}}^2 2{\mathrm{s}}^2 2{\mathrm{p}}^6 3{\mathrm{s}}^2 3{\mathrm{p}}^3$
$\mathrm{C} = 1{\mathrm{s}}^2 2{\mathrm{s}}^2 2{\mathrm{p}}^6 3{\mathrm{s}}^2 3{\mathrm{p}}^5$

The stable form of A may be represented by the formula: