CO is isoelectronic with

(a) ${\mathrm{NO}}^{+}$

(b) ${\mathrm{N}}_2$

(c) ${\mathrm{SnCl}}_2$

(d) ${\mathrm{NO}}_2^{-}$

Choose the correct option

1. (a), (b)

2. (b), (c)

3. (c), (d)

4. (b), (d)

Match List-I (Molecules) with List-II (Bond order),
and mark the appropriate choice

Choose the correct match from the options given below :

1. (a) $\to$ (iii), (b) $\to$ (iv), (c) $\to$ (i), (d) $\to$ (ii)

2. (a) $\to$ (i), (b) $\to$ (ii), (c) $\to$ (iii), (d) $\to$ (iv)

3. (a) $\to$ (ii), (b) $\to$ (i), (c) $\to$ (iv), (d) $\to$ (iii)

4. (a) $\to$ (iv), (b) $\to$ (iii), (c) $\to$ (ii), (d) $\to$ (i)

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⁻

Which of the following attain the linear structure?

(a) ${\mathrm{BeCl}}_2$

(b) ${\mathrm{NCO}}^{+}$

(c) ${\mathrm{NO}}_2$

(d) ${\mathrm{CS}}_2$

Choose the correct option

Which of the following have identical bond order?

(a) ${\mathrm{CN}}^{-}$

(b) ${\mathrm{NO}}^{+}$

(c) ${\mathrm{O}}_2^{-}$

(d) ${\mathrm{O}}_2^{2-}$

Choose the correct option

1. (a), (b)

2. (b), (c)

3. (c), (d)

4. (b), (d)

The hybridization of orbitals of N atom in NO₃⁻, NO₂⁺ and  NH₄⁺ are respectively: 

1. sp, sp², sp³

2. sp², sp, sp³

3. sp, sp³, sp²

4. sp², sp³, sp

An isoelectronic pair among the following is:

(a) Na⁺, Mg²⁺ 

(b) Al³⁺, O^– 

(c) Na⁺, O^2– 

(d) N^3-, Cl^– 

The relation between hydrogen bond and the van der Waals forces is:

The important condition/s required for the linear combination of atomic orbitals to form molecular orbitals is:

Select the pair of isostructural species: