NH₃ and BF₃ form adduct readily because they form

1. Ionic bond

2. Covalent bond

3. Co-ordinate bond

4. Hydrogen bond

A $\sigma$ bonded molecule MX₃ is T-shaped. The number of non-bonding pairs of electrons is:

1. 0

2. 2

3. 1

4. Can be predicted only if atomic number of M is known

The hybrid state of S in SO₃ is similar to that of

1. C in C₂H₂

2. C in C₂H₄

3. C in CH₄

4. C in CO

Compound in which central atom assumes sp³d hybridisation is

1. SO₃

2. PCl₅

3. SO₂

4. PCl₃

In a chemical change from PCl₃ $\to$ PCl₅ the hybrid state of P changes from :

1. sp² to sp³

2. sp³ to sp²

3. sp³ to sp³d

4. sp³ to dsp

The shape of covalent molecule AX₃ is:

If the central atom in certain molecule has two lone pairs and three bond pairs, the shape of the molecule could be:

The geometrical arrangement and shape of $I_3^{-}$ are respectively:

1. Trigonal bipyramidal geometry, linear shape

2. Hexagonal structure, linear shape

3. Triangular planar geometry, triangular shape

4. Tetrahedral geometry, pyramidal shape

Which has non-zero dipole moment?

1. PCl₅

2. PCl₃F₂

3. PCl₃Br₂

4. PCl₃(CH₃)₂

Which molecules/ions are most paramagnetic?

1. B₂

2. C₂

3. $O_2^{+}$

4. $O_2^{-}$