Chemical bond implies

• attraction and repulsion

• attraetion and repulsion balanced at a particular distance

• attraction

• repulsion

The percentage s-character of the hybrid orbitals in methane, ethene and ethyne are respectively

• 25, 33, 50

• 25, 50, 75

• 50, 75, 100

• 10, 20, 40

253.

Which of the following represents the Lewis structure of N₂ molecule?

• 

• 

• 

• 

For a stable molecule, the value of bond order must be

• there is no relationship between stability and bond order

• zero

• positive

• negative

Which of the following has the highest bond order?

• N₂

• O₂

• He₂

• H₂

During the formation of a chemical bond

• electron-electron repulsion becomes more than the nucleus-electron attraction.

• energy of the system does not change.

• energy increases

• energy decreases

Which of the following is diamagnetic?

• H${}_2^{+}$

• O₂

• Li₂

• He${}_2^{+}$

In acetylene molecule, between the carbon atoms there are

• three pi bonds

• one sigma and two pi bonds

• two sigma and one pi bonds

• three sigma bonds

The number of nodal planes present in σ^* antibonding orbitals is

• 1

• 2

• 0

• 3

The overlapping of orbitals in benzene is of the type

• sp-sp

• p-p

• sp²-sp²

• sp³-sp³