ECAT Pre Engineering Chemistry Chapter 6 MCQ Test With Answer

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

The tendency of an atom to attract shared electron pair towards itself is called

• Covelent bond A
• Electronegativity B
• Ionization potential C
• Electronic affinity D

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

Mg becomes isoelectronic with neon when it

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

The number of bonds in nitrogen molecule is

• 
  A
• 
  B
• 
  C
• 
  D

The degree of polarity of molecule is known as its

• Dipole moment A
• Moment arm B
• Bond energy C
• Ionic character D

Coordinate covalent bond is present in the molecules

• H₂O A
• BF₃ B
• SiO₂ C
• SO₂ D

The shape of the molecule SF₂Cl₂is

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

The bond order O₂molecule is

• 1 A
• 2 B
• 3 C
• Zero D

Which of the following molecules have sp³hybridized carbon

• CH₄ A
• C₂H₄ B
• C₂H₂ C
• CO₂ 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

A molecule in which sp²hybrid orbitals are used by the central atom in forming covalent bonds in

• He₂ A
• SO₂ B
• PCl₅ C
• N₂ D

Molecular orbital picture of N₂ indicates

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

Elements have the tendency to attain 8 electrons in their valence shell. This is known as

• Octer rule A
• Hunds rule B
• Pauli exclusion principle C
• Auf ban principle D

The bond angle depends upon the

• Types of bonds A
• Number of bonds B
• Non-bonding electron pairs C
• All of the above D

Which of the following hydrides has the lowest boiling point?

• H₂O A
• H₂S B
• H₂S3 C
• H₂Te D

In sp²hybridization bond angle is _____

• 120° A
• 180° B
• 109.5° C
• None D

The structure of ICI₂is

• Trigonal A
• Trigonal bipyramidal B
• Octahedral 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

Number of sigma bonds in P₄O₁₀is

• 6 A
• 7 B
• 17 C
• 16 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

Which one of these is weakest?

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

The nature of interparticle forces in benzene is

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

Which of the hydrogen halides has the highest percentage of ionic character

• HCl A
• HBr B
• HF C
• HI D

Which of the following has highest bond order

• 
  A
• 
  B
• 
  C
• 
  D

The shape of gaseous SnCl₂is

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

In H₂O molecule the bond angle is

• 90° A
• 109.5° B
• 107° C
• 104.5° D

The bond angle H - O - H in ice ins closest to

• 120° , 28^' A
• 60° B
• 90° C
• 109° 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