The formal charges of C and O atoms in CO₂ ( :Ö= C=:Ö) are respectively

• 1, -1

• -1,1

• 2,-2

• 0,0

According to molecular orbital theory, the total number of bonding electron pairs in O₂ is

• 2

• 3

• 5

• 4

Which of the following does not have triple bond between the atoms?

• N₂

• CO

• NO

• C${}_2^{2-}$

In which one of the following pairs the two species have identical shape, but differ in hybridisation?

• I${}_3^{-}$, BeCl₂

• NH₃, BF₃

• XeF₂, I${}_3^{-}$

• NH${}_4^{+}$, SF₄

205.

What are the shapes of ethyne and methane?

• Square planar and linear

• Tetrahedral and trigonal planar

• Linear and tetrahedral

• Trigonal planar and linear

The bond angle of bond in methoxy methane is

• 111.7°

• 109°

• 108.9°

• 180°

Which of the following compounds has zero dipole moment?

• 1, 4-dichlorobenzene

• 1, 2-dichlorobenzene

• 1, 3-dichlorobenzene

• 1-chloro-2-methyl benzene

The number of electrons is the valence shell of the central atom of a molecules is 8. The molecule is

• BCl₃

• BeH₂

• SCl₂

• SF₆

Which one of the following has longest covalent bond distance?

• C—C

• C—H

• C—N

• C—O

In which of the following molecules, all bond lengths are not equal?

• SF₆

• PCl₅

• BCl₃

• CCl₄