Chemical Bonding and Molecular Structure

Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them

1. NO < O2- < C22- < He2+
2. O2- < NO < C22- < He2+
3. C22- < He2+ < O2- < NO
4. He2+ < O2- < NO < C22-

The correct order of increasing bond angles in the following triatomic species is

1. NO2+ < NO2 < NO2-
2. NO2+ < NO2- < NO2
3. NO2- < NO2+ < NO2
4. NO2- < NO2 < NO2+

The angular shape of ozone molecule (O3) consists of

1. 1σ and 1π bond
2. 2σ and 1π bond
3. 1σ and 2π bonds
4. 2σ and 2π bonds

In which of the following pairs, the two species are isostructural?

1. SO32- and NO3-
2. BF3 and NF3
3. BrO3- and XeO3
4. SF4 and XeF4

The correct order of C-O bond length among CO, CO32-, CO2 is

1. CO < CO32- < CO2
2. CO32- < CO2 < CO
3. CO < CO2 < CO32-
4. CO2 < CO32- < CO

Which of the following is not a correct statement?

1. Multiple bonds are always shorter than corresponding single bonds.
2. The electron-deficient molecules can act as Lewis acids.
3. The canonical structures have no real existence.
4. Every AB5 molecule does in fact have square pyramid structure.

Which of the following is not isostructural with SiCl4 ?

1. NH4+
2. SCl4
3. SO42-
4. PO43-

Which of the following species has a linear shape?

1. O3
2. NO2-
3. SO2
4. NO2+

The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of NH3 (1.5 D) is larger than that of NF3 (0.2 D). This is because

1. in NH3 the atomic dipole and bond dipole are in the opposite directions whereas in NF3 these are in the same direction
2. in NH3 as well as in NF3 the atomic dipole and bond dipole are in the same direction
3. in NH3 the atomic dipole and bond dipole are in the same direction whereas in NF3 these are in opposite directions
4. in NH3 as well as in NF3 the atomic dipole and bond dipole are in opposite directions.

In which of the following molecules are all the bonds not equal?

1. NF3
2. ClF3
3. BF3
4. AlF3