ECAT Pre Engineering Chemistry Chapter 6 MCQ Test With Answer

Atoms obey octet rule by sharing-electrons making covalent bonds according to

• Lewis and Kossal theory A
• Valance bond theory B
• VSEPR theory C
• Molecular orbital theory D

In which of the following theories the hybridizationis considered

• Vsepr A
• Lewis B
• Molecule orbital C
• Valence bond D

N-atom forms three covalent bonds, its electronic configuration is

• 
  A
• 
  B
• 
  C
• 
  D

In a group the atomic size increase downward due to

• Addition of electronic shells A
• Increase in the proton number B
• Repulsion of electrons C
• All of the above D

Which of the following molecules have sp³hybridized carbon

• CH₄ A
• C₂H₄ B
• C₂H₂ C
• CO₂ D

Which of the following molecules have multiple bonds

• CH₄ A
• C₂H₄ B
• C₂H₆ C
• CCI₄ D

Which of the following is a polar molecules

• Carbon dioxide A
• Carbon tetrachloride B
• Methanol C
• Ethane D

Mg becomes isoelectronic with neon when it

• Loses two electrons A
• Gains two electrons B
• Loses 1 electron C
• Gains 1 electron D

Which is made by coordinate covalent bond

• H₃O⁺ A
• H₂O B
• CH₄ C
• HCl D

Which of the following charge

• Li A
• Be B
• H C
• He D

• The ionization energy of A is high and electron affinity of B is low A
• The ionization energy of A is low and electron affinity of B is high B
• Both the ionization energy of A and electron off affinity of B are high C
• Both the ionization energy of A and electron affinity of B are low D

If two lone pairs are present then bond angle of tetrahedral compound reduces to ______ degrees

• 109.5° A
• 107.5° B
• 104.5° C
• None D

Planar geometry of molecules is due to

• sp³hybridization A
• sp²hybridization B
• sp hybridization C
• P - p overlap D

Antibonding MO is formed by

• Addition of atomic orbitals A
• Substraction of atomic orbitals B
• Multiplication of atomic orbitals C
• None of these D

When of the following is isolelectronic with krypton

• Ca⁺⁺ A
• Al⁺⁺⁺ B
• Br^-1 C
• I^-1 D

• 154 pm A
• 133 pm B
• 120 pm C
• 150 pm D

The shape of gaseous SnCl₂is

• Tetrahedral A
• Linear B
• Angular C
• T-shaped D

During the formation of a chemical bond the potential energy of the system

• Decreases A
• Increases B
• Does not change C
• None of these D

On the basis of VSEPR theory SO₂is a

• Liner molecule A
• A bent molecule B
• A strong molecule C
• A gaseous molecule D

XeF₄has shape of

• Sphere A
• Trigonal bipyramidal B
• Tetrahedral C
• Square planar D

The boiling point of heavy water is

• 108°C A
• 101.4°C B
• 99°C C
• 110°C D

Hydrogen chloride molecule contains

• Covalent bond A
• Double bond B
• Co-ordinate bond C
• Electrovalent bond D

• Excitantion of an electron from 2s to 2p-orbital A
• Transfer of three electrons from B to the other atoms B
• Excitation of two electrons form 2s orbital to 2p orbital C
• Formation of molecular ion D

Noble gases have the electronic configuration with their valance shell ns²np⁶except one

• He A
• Ne B
• Kr C
• Xe D

Tripple bond is present in

• O₂ A
• H₂ B
• N₂ C
• Cl₂ D

The shape of the molecule SF₂Cl₂is

• Trigonal bipyradmidal A
• Cubic B
• Octahedral C
• Tetrahedral D

Which of the following has unchanged valency?

• H A
• Na B
• Fe C
• Oxygen D

Molecular orbital picture of N₂ indicates

• One unpaired electron A
• Two unpaired electron B
• No unpaired electron C
• None of these D

The number of bonds in nitrogen molecule is

• 
  A
• 
  B
• 
  C
• 
  D

Ionization energies increase from left to right along the period due to

• Increase in nuclear charge A
• Repulsion of electron increases B
• Repulsion of protons increase C
• Atomic size increase along the period D