ECAT Pre Engineering Chemistry Chapter 6 MCQ Test With Answer

Which of the following molecules has a net dipole moments

• CO₂ A
• CS₂ B
• SO₂ C
• CCI₄ D

XeF₄has shape of

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

• 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

Which of the following species is paramagnetic?

• CO₂ A
• NO B
• O^2- C
• CN D

Number of sigma bonds in P₄O₁₀is

• 6 A
• 7 B
• 17 C
• 16 D

Hydrogen chloride molecule contains

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

The bond order in No is 2.5 while that in NO⁺is 3.Which of the following statements is true for these two species?

• Bond length in NO⁺is greater than in NO A
• Bond length in unpredictable B
• Bond length in NO⁺is equal to that in NO C
• Bond length in NO is greater than in NO⁺ D

On the basis of VSEPR theory SO₂is a

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

Two H-atom combine to form a strong H₂molecule due to

• Increase in potential energy A
• Decrease in potential energy B
• Energy remains unchanged C
• Distance is increased D

In OF₂, number of bond pairs and Ione paris of electrons are respectively

• 2,6 A
• 2,8 B
• 2,10 C
• 2,9 D

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

• 
  A
• 
  B
• 
  C
• 
  D

Atomic number of Al is 13. When it forms ionic bond with oxygen the number of electrons lost by 1 Al atom is

• 1 A
• 2 B
• 3 C
• 4 D

Shielding effect intervening electrons causes

• Decreases in atomic radii in a period from right to left A
• Increase in atomic radii in a period from left to righ t B
• Decrease in atomic radii down the group C
• Increase in atomic radii down the group D

Mg becomes isoelectronic with neon when it

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

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

All covalent bonds formed between the two atoms are non-polar when

• Covalent bond between two non-metal atoms A
• Covalent bond between metal and non-metal B
• Covalent bond between two atoms of same element C
• Covalent bond between metal atoms D

The shape of gaseous SnCl₂is

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

Which for the following has no dipole moment

• HCI A
• H₂S B
• H₂O C
• CO₂ D

Which of the following phenomena will occur when two atoms of the elements having same spin of electron approach for bonding?

• Orbital overlap will not occur A
• Bonding will not occur B
• Both (A) and (B) are correct C
• None of the above are correct D

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

• He A
• Ne B
• Kr C
• Xe D

The number of bonds in nitrogen molecule is

• 
  A
• 
  B
• 
  C
• 
  D

The nature of interparticle forces in benzene is

• Dipole-dipole interaction A
• Dispersion force B
• Ion-dipole interaction C
• H-bonding D

The bond order O₂molecule is

• 1 A
• 2 B
• 3 C
• Zero D

Molecular orbital picture of N₂ indicates

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

Which one of these is weakest?

• Ionest bond A
• Covalent bond B
• Metallic bond C
• Van der Waal's forces D

Maximum hydrogen bonds in water are

• 4 A
• 3 B
• 2 C
• 8 D

When an electron is absorbed in an empty or partially filled orbital of an atom, the energy released is called

• Ionization energy A
• Potential energy B
• Electron affinity C
• Bond energy D

Ca, Mg, Be, Ba, belong to the same group, the order of their ionization energy values is

• Be > Mg> Ca > Ba A
• Ba > Ca > Mg > Be B
• Ca > Mg > Be > Ba C
• Ba > Mg > Ca > Be D

Coordinate covalent bond is present in the molecules

• H₂O A
• BF₃ B
• SiO₂ C
• SO₂ D