ECAT Pre Engineering Chemistry Chapter 6 MCQ Test With Answer

Which one of these is weakest?

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

SnCI₂have ______ shape

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

Generally ionization energy of atoms decreases by

• Decreases in atomic size A
• Increase in atomic size B
• Increase in nuclear charge C
• None of these D

Number of sigma bonds in P₄O₁₀is

• 6 A
• 7 B
• 17 C
• 16 D

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

• Ca A
• Ba B
• K C
• Al D

Which of the following has highest bond order

• 
  A
• 
  B
• 
  C
• 
  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

The number of electron pairs shared in carbon tetrachloride molecule is

• 2 A
• 3 B
• 4 C
• 1 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 carbon is more electronegative?

• sp³- hybridized carbon A
• sp-hybridized carbon B
• sp²-hybridized carbon C
• always same irrespective of its hybrid state D

B-atom in BF₃has

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

Ionic radius, in a period from left to right

• Increases A
• Decreases B
• Decreases then increases C
• Increases and decreases D

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

When two hydrogen atoms approach to form a chemical bond

• The repulsive forces dominate the attractive forces A
• The attractive forces, dominate the repulsive forces B
• The energy of atoms increases C
• The two atoms start ionization D

The bond order for He₂molecule is

• zero A
• 1/2 B
• 1 C
• 2 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

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

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

Shape of CIO₃is

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

Tripple bond is present in

• O₂ A
• H₂ B
• N₂ C
• Cl₂ 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

On the basis of VSEPR theory SO₂is a

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

Which of the following molecules has a net dipole moments

• CO₂ A
• CS₂ B
• SO₂ C
• CCI₄ D

The degree of polarity of molecule is known as its

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

Inter molecular forces in solid hydrogen are

• Covalent forces A
• Van der Waal forces or London dispersion forces B
• Hydrogen bonds C
• All of these D

The number of bonds in nitrogen molecule is

• 
  A
• 
  B
• 
  C
• 
  D

Which of the following hydrides has the lowest boiling point?

• H₂O A
• H₂S B
• H₂S3 C
• H₂Te D

The shape of gaseous SnCl₂is

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