The incorrect statement among the following regarding the molecules of CH_4, NH₃, and H₂O is:

1.	The H-O-H bond angle in H2O is larger than the H-C-H bond angle in CH4.
2.	The H-O-H bond angle in H2O is smaller than the H-N-H bond angle in NH3.
3.	The H-C-H bond angle in CH4 is larger than the H-N-H bond angle in NH3.
4.	The H-C-H bond angle in CH4, the H-N-H bond angle in NH3, and the H-O-H bond angle in H2O are all greater than 90°.

The pair of electrons in the given carbanion, CH₃C≡C^-, is present in which of the following orbitals?

Predict the correct order among the following.

(1) lone pair-lone pair>bond pair-bond pair>lone pair-bond pair

(2) bond pair-bond pair>lone pair-bond pair>lone pair-lone pair

(3) lone pair-bond pair>bond pair-bond pair>lone pair-lone pair

(4) lone pair-lone pair>lone pair-bond pair>bond pair-bond pair

In which of the following molecules, all atoms are coplanar ?

In which of the following compounds is an intramolecular hydrogen bond present?

Which one of the following pairs of species have the same bond order?

(1) CO, NO

(2) O_2-  , CN-

(3) CN- , NO+

(4) N+ , CN+

The species, having bond angles of 120° is : 

1. PH₃ 

2. ClF₃

3. NCl₃

4. BCl₃

Which of the following species has a bond angle of \(120^\circ\)?
1. \(\mathrm{{SF}_6}\)
2. \(\mathrm{NCl_3}\)
3. \(\mathrm{BCl_3}\)
4. \(\mathrm{PH_3}\)

The hybridisations of atomic orbitals of nitrogen in \(\mathrm{NO}^{+}\), \(N O_3^{-}\) and NH₃ respectively are:

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

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

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

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

Pair of ions among the following that are isoelectronic and isostructural: 

1.  ${\mathrm{CO}}_3^{2-},$ ${\mathrm{NO}}_3^{-}$

2.  ${\mathrm{ClO}}_3^{-},$ ${\mathrm{CO}}_3^{2-}$

3.  ${\mathrm{SO}}_3^{2-},$ ${\mathrm{NO}}_3^{-}$

4.  ${\mathrm{ClO}}_2^{-},$ ${\mathrm{SO}}_3^{2-}$