ECAT Pre Engineering Chemistry Chapter 6 MCQ Test With Answer

The boiling point of heavy water is

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

Covalent compounds are soluble in

• Polar solvents A
• Non-polar solvents B
• Concentrated acids C
• All solvents D

According to VSEPR theory, the shape of the water molecule is

• Octahedral A
• Distorted tetrahedral B
• Planar triangle C
• Linear D

In sp²hybridization bond angle is _____

• 120° A
• 180° B
• 109.5° C
• None D

The bond order for He₂molecule is

• zero A
• 1/2 B
• 1 C
• 2 D

Which of the following charge

• Li A
• Be B
• H C
• He D

Which one of these is weakest?

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

H-bonding is not present in

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

The shape of gaseous SnCl₂is

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

The formation of compounds like PF₅, BCI₃, SF₆indicates that

• These halides are ionic A
• These halides are covalent B
• They are Lewis acids C
• Octet rule not obeyed so the rule is not universal D

The ionic bonds are

• Unidirectional A
• Bi-directional B
• Non-directional C
• Multi-directional D

Which of the following molecules has a net dipole moments

• CO₂ A
• CS₂ B
• SO₂ C
• CCI₄ 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

A bond between two atoms may be obtained by sharing of electrons such a bond is called

• An ionic bond A
• A coordinate bond B
• A dative bond C
• A covalent bond D

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

• 
  A
• 
  B
• 
  C
• 
  D

Size of an anion is increased as compared to its atom because of the

• Addition of new shell A
• Repulsion of electrons in the valence shell B
• Decrease in nuclear charge C
• Increase in the unclear charge D

Which of the following species is paramagnetic?

• CO₂ A
• NO B
• O^2- C
• CN D

The shape of CIO^-₃according to valence shell electron pair repulsion theory will be

• Planar triangle A
• Pyramidal B
• Tetrahedral C
• Square planar D

Which of the following has zero depole-moment?

• CIF A
• PCl₃ B
• SiF₄ C
• CFCl₄ D

Which of the following is a polar molecules

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

One of the following bonds is polar but compound is non-polar

• H₂O A
• NH₃ B
• HCl C
• CO₂ D

Water H₂O is liquid while hydrogen sulphide H₂S is a gas beause

• Water has higher molecular weight A
• Hydrogen sulphide is a weak acid B
• Sulphure has high electronegativity than oxyhe C
• Water molecules associate through hydrogen bonding D

On the basis of VSEPR theory SO₂is a

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

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

• He A
• Ne B
• Kr C
• Xe D

The degree of polarity of molecule is known as its

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

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 number of bonds in nitrogen molecule 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

Fluorine molecule is formed by

• The axial p-p overlap A
• The sidewise p-p overlap B
• The axial s-p overlap C
• The overlap of two sp²hybrid orbitals D