ECAT Pre Engineering Chemistry Chapter 6 MCQ Test With Answer

The bond angles in methane CH₄are equal to

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

Which is made by coordinate covalent bond

• H₃O⁺ A
• H₂O B
• CH₄ C
• HCl D

Which of the following molecules have its central atom sp²hybridized

• CH₄ A
• C₂H₂ B
• C₂H₄ C
• CCl₄ D

Which one of these is weakest?

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

Mg becomes isoelectronic with neon when it

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

Which of the following is a polar molecules

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

In H₂O molecule the bond angle is

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

The bond order O₂molecule is

• 1 A
• 2 B
• 3 C
• Zero D

The number of bonds in nitrogen molecule is

• 
  A
• 
  B
• 
  C
• 
  D

Which of the following molecules has unpaired electrons in anti-bonding molecular orbitals?

• O₂ A
• N₂ B
• Br₂ C
• F₂ D

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

• Ca A
• Ba B
• K C
• Al 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

Which of the following molecules have sp³hybridized carbon

• CH₄ A
• C₂H₄ B
• C₂H₂ C
• CO₂ D

The nature of interparticle forces in benzene is

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

The number of electron pairs shared in carbon tetrachloride molecule is

• 2 A
• 3 B
• 4 C
• 1 D

Which of the following phenomena will occur when two atoms of the elements having same spin of electron approach for bonding?

• Orbital overlap will not occur A
• Bonding will not occur B
• Both (A) and (B) are correct C
• None of the above are correct 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

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

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

Which of the following hydrides has the lowest boiling point?

• H₂O A
• H₂S B
• H₂S3 C
• H₂Te D

On the basis of VSEPR theory SO₂is a

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

Maximum hydrogen bonds in water are

• 4 A
• 3 B
• 2 C
• 8 D

The electron affinity of chlorine may be represented by the equation

• 
  A
• 
  B
• 
  C
• 
  D

Which of the following molecules has a net dipole moments

• CO₂ A
• CS₂ B
• SO₂ C
• CCI₄ D

Molecular orbital picture of N₂ indicates

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

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

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

The force which holds the atoms together to form a compound is called

• A chemical bond A
• Van der waal's force B
• Dispersion force C
• London force D

• Excitantion of an electron from 2s to 2p-orbital A
• Transfer of three electrons from B to the other atoms B
• Excitation of two electrons form 2s orbital to 2p orbital C
• Formation of molecular ion D