ECAT Pre Engineering Chemistry Chapter 6 MCQ Test With Answer

Which for the following has no dipole moment

• HCI A
• H₂S B
• H₂O C
• CO₂ D

Nitrogen in NH₃is sp³hybridized but the bond angle in NH₃is 107° and not 109.5° due to

• sp³orbital planar A
• sp³orbital trigonal B
• Repulsion between lone pair and bonded pairs C
• None of them D

Which of the following molecules has a net dipole moments

• CO₂ A
• CS₂ B
• SO₂ C
• CCI₄ D

Shape of CIO₃is

• Triangular pyramidal A
• Tetrahedral B
• Triangular planar C
• Triangular bipyramidal D

The three N - Hσ-bonds are made by

• sp³- s overlap A
• sp²- s overlap B
• P - p overlap C
• sp - overlap D

The nature of interparticle forces in benzene is

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

The number of bonds in nitrogen molecule is

• 
  A
• 
  B
• 
  C
• 
  D

Electronegativity values of the elements F, CI and Br vary

• F > CI > Br A
• Br > CI > F B
• Cl > Br > F C
• CI > F > Br D

Which of the following has unchanged valency?

• H A
• Na B
• Fe C
• Oxygen D

The electron affinity of chlorine may be represented by the equation

• 
  A
• 
  B
• 
  C
• 
  D

Which of the following species has unpaired electrons in antibonding molecular orbitals

• 
  A
• 
  B
• 
  C
• 
  D

The driving force for making a bond is

• To attain noble gas electronic configuration A
• To make soled compounds B
• To make different compounds C
• To make gaseous substances D

Outer shells of two elements X and Y have two and six electrons respectively. If they combine, the expected formula of compound will be

• XY A
• X₂Y B
• X₂Y₃ C
• XY₂ D

According to MO Theory, the species O₂+ possesses

• bond order of 2.5 A
• three unpaired B
• diamagnetic character C
• stability lower then O₂ D

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

The structure of ICI₂is

• Trigonal A
• Trigonal bipyramidal B
• Octahedral C
• Square planar D

In sp²hybridization bond angle is _____

• 120° A
• 180° B
• 109.5° C
• None D

The bond angles in methane CH₄are equal to

• 109.5° A
• 107.5° B
• 104.5° C
• 120° D

Which of the following charge

• Li A
• Be B
• H C
• He D

In H₂O molecule the bond angle is

• 90° A
• 109.5° B
• 107° C
• 104.5° 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 bond order for He₂molecule is

• zero A
• 1/2 B
• 1 C
• 2 D

Generally the bond formed by metals with non-metals is

• Ionic A
• Covalent B
• Polar C
• Non- polar D

Which of the following has highest bond order

• 
  A
• 
  B
• 
  C
• 
  D

H-bonding is not present in

• Glycerine A
• Water B
• Hydrogen sulphide C
• Hydrogen fluride 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

Which of the following species is paramagnetic?

• CO₂ A
• NO B
• O^2- C
• CN D

Which of the following has polar bond

• O₂ A
• N₂ B
• HCl C
• Cl₂ D

On the basis of VSEPR theory SO₂is a

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

The boiling point of heavy water is

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