In a chemical change from ${\mathrm{PCl}}_3 \stackrel{ }{\to }{\mathrm{PCl}}_5$, the hybrid state of P changes from:
1. sp² to sp³
2. sp³ to sp²
3. sp³ to sp³d
4. sp³ to dsp²

The geometrical arrangement and shape of ${\mathrm{I}}_3^{-}$ are respectively

1. Trigonal bipyramidal geometry, linear shape

2. Hexagonal structure, linear shape

3. Triangular planar geometry, triangular shape

4. Tetrahedral geometry, pyramidal shape

Mark the incorrect order of the bond angle:

1. NH₃ > NF₃

2. NF₃ <  PF₃

3. NH₃ > PH₃

4. NH₃ > H₂O

Which molecules/ions are most paramagnetic?

1. B₂

2. C₂

3. ${\mathrm{O}}_2^{+}$

4. ${\mathrm{O}}_2^{-}$

In which case observed dipole moment is greater than theoretical dipole moment?

1.

2.

3.

4.

Which has linear shape but not sp hibridisation ?

1. ${\mathrm{XeF}}_2$

2. ${\mathrm{I}}_3^{-}$

3. ${\mathrm{CO}}_2$

4. Both 1 and 2

Which has highest bond energy ?

1. CO

2. CO⁺

3. N₂

4. ${\mathrm{N}}_2^{+}$

Which has highest bond angle ?

(1) NH₃

(2) H₂O

(3) H₂S

(4) PH₃

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