Revision Test

According to the octet rule, which of the following statement is false?

• Carbon atom can form 1 single bond and 1 triple bond to complete octet.

• Oxygen atom which forms 2 single bond possesses two lone pair electrons.

• Nitrogen atom which forms 3 single bonds possesses one lone pair electron.

• Sulphur atom which forms 1 double bond possesses one lone pair electron.

• Phosphorous atom can form 1 single bond and 1 double bond to complete octet.

Which position of the indicated atoms is not correct?

• a

• b

• c

• d

• e

What is the formal charge on nitrogen atom in nitrate ion, NO₃^-?

• 0

• -1

• +1

• -2

• +2

What is the oxidation state on nitrogen atom in nitrate ion, NO₃^-?

• 0

• -1

• +1

• +3

• +5

How many resonance structures are there in nitrate ion, NO₃^-?

• 1

• 2

• 3

• 4

• There is no resonance structure in this molecule.

What is the molecular geometry and bond angle of nitrate ion, NO₃^-?

• linear, 180^๐

• trigonal planar, 120^๐

• tetrahedral, 120^๐

• trigonal pyramidal, 120^๐

• tetrahedral, 109.5^๐

Which of the following covalent bond represents the highest positive charge on carbon atom?

• C–H

• C–O

• C–F

• C–Cl

• C–C

Which of the following molecule is classified as non-polar molecule?

• H₂O

• NH₃

• CCl₄

• CHCl₃

• HCN

What is the strongest intermolecular force which can be found in CH₃F?

• London dispersion force

• dipole-dipole interaction

• hydrogen bonding

• ionic bonding

• covalent bonding

Which of the following molecule has the highest boiling point?

• CH₄

• CCl₄

• CHCl₃

• CHI₃

• CH₃F