The compound that has the largest H–M–H bond angle (M=N, O, S, C), is:

1.	H2O	2.	CH4
3.	NH3	4.	H2S

The isostructural pairs among the following are:

1. C and D only
2. A and B only
3. A and C only
4. B and C only

According to molecular orbital theory, which of the following molecules is not expected to be stable?

Among the following, the compound(s) containing no covalent bonds is/are:
KCl, PH₃, O₂, B₂H₆, H₂SO₄

1. KCl, B₂H₆, PH₃

2. KCl, H₂SO₄

3. KCl

4. KCl, B₂H₆

How many lone pairs of electrons are present in \({I }_{3}^{-}\) ion?

In $\stackrel{1}{\mathrm{C}}{\mathrm{H}}_2=\stackrel{2}{\mathrm{C}}=\stackrel{3}{\mathrm{C}}\mathrm{H}-\stackrel{4}{\mathrm{C}}{\mathrm{H}}_3$ molecule, the hybridization of carbon 1,2,3 and 4 respectively are :

1. ${\mathrm{sp}}^3,\mathrm{sp},{\mathrm{sp}}^3,{\mathrm{sp}}^3$

2. ${\mathrm{sp}}^2,{\mathrm{sp}}^2,{\mathrm{sp}}^2,{\mathrm{sp}}^3$

3. ${\mathrm{sp}}^2,\mathrm{sp},{\mathrm{sp}}^2,{\mathrm{sp}}^3$

4. ${\mathrm{sp}}^2,{\mathrm{sp}}^3,{\mathrm{sp}}^2,{\mathrm{sp}}^3$

Which pair of oxides are acidic in nature?

1. ${\mathrm{B}}_2{\mathrm{O}}_3,\hspace{0.17em}\mathrm{CaO}$

2. ${\mathrm{B}}_2{\mathrm{O}}_3,\hspace{0.17em}{\mathrm{SiO}}_2$

3. ${\mathrm{N}}_2\mathrm{O},\hspace{0.17em}\mathrm{BaO}$

4. $\mathrm{CaO},\hspace{0.17em}{\mathrm{SiO}}_2$

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)

Which of the following species is not paramagnetic?

1. O₂

2. B₂

3. NO

4. CO