ECAT Pre Engineering Chemistry Chapter 6 MCQ Test With Answer

B-atom in BF₃has

• sp³hybridization A
• sp²hybridization B
• sp hybridization C
• no hybridization 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

Among the alkaline earth metals the element forming predominantly covalent compounds is

• Be A
• Mg B
• Sr C
• calcium D

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

• 
  A
• 
  B
• 
  C
• 
  D

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

The geometry of 4 sp³hybrid orbitals on an atom is

• Square planar A
• Tetrahedral B
• Trigonal planar C
• Linear D

Which of the following geometry is associated with the compound in which the central atom assumes sp³d hybridization?

• Planar A
• Pyramidal B
• Angular C
• Trigonal bipyramidal D

In H₂O molecule the bond angle is

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

In sp²hybridization bond angle is _____

• 120° A
• 180° B
• 109.5° C
• None D

The covalent bonds are

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

Hydrogen chloride molecule contains

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

Antibonding MO is formed by

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

Molecular orbital picture of N₂ indicates

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

Which of the following is a polar molecules

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

Which of the following molecules have its central atom sp²hybridized

• CH₄ A
• C₂H₂ B
• C₂H₄ C
• CCl₄ D

Tripple bond is present in

• O₂ A
• H₂ B
• N₂ C
• Cl₂ D

The nature of interparticle forces in benzene is

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

The atomic radius of hydrogen is 37

• Pecometer A
• Manometer B
• Angstrom C
• Micrometer D

Which of the following statements is not correct regarding bonding molecular orbitals?

• Bonding molecular orbitals possess less energy than atomic orbitals from which they are formed A
• Bonding molecular orbitals have low electron density between the two nuclei B
• Every electron in the bonding molecular orbitals contributes to the attraction between atoms C
• Bonding molecular orbitals are formed when the electron waves undergo constructive interference D

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

• H₂O A
• NH₃ B
• HCl C
• CO₂ D

The shape of methanol, ammonia and water molecule can be explained by assuming

• Sp³ hybridization A
• Sp²hybridization B
• Sp hybridization C
• All of these 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

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

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

An ionic compound M₂S₃is formed by the metal M,, the metal is

• Ca A
• Ba B
• K C
• Al 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

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

Covalent compounds are soluble in

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

On the basis of VSEPR theory SO₂is a

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

SnCI₂have ______ shape

• Planner A
• Tetrahedral B
• Angular C
• None D