ECAT Pre Engineering Chemistry Chapter 6 MCQ Test With Answer

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

Number of sigma bonds in P₄O₁₀is

• 6 A
• 7 B
• 17 C
• 16 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

All covalent bonds formed between the two atoms are non-polar when

• Covalent bond between two non-metal atoms A
• Covalent bond between metal and non-metal B
• Covalent bond between two atoms of same element C
• Covalent bond between metal atoms D

The shape of the molecule SF₂Cl₂is

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

Which of the following species has unpaired electrons in antibonding molecular orbitals

• 
  A
• 
  B
• 
  C
• 
  D

Which of the following molecules have sp³hybridized carbon

• CH₄ A
• C₂H₄ B
• C₂H₂ C
• CO₂ 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

Coordinate covalent bond is present in the molecules

• H₂O A
• BF₃ B
• SiO₂ C
• SO₂ 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

Generally the bond formed by metals with non-metals is

• Ionic A
• Covalent B
• Polar C
• Non- polar D

The equation for the first ionization energy of hydrogen is

• 
  A
• 
  B
• 
  C
• 
  D

The structure of ICI₂is

• Trigonal A
• Trigonal bipyramidal B
• Octahedral C
• Square planar D

The most suitable method of the separation of a mixture of ortho and para-nitrophenol mixed in the ratio of 1: 1 is

• Distrillation A
• Crystallization B
• Vapourisation C
• Colour spectrum 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 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

The shape of gaseous SnCl₂is

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

Ionic radius, in a period from left to right

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

B-atom in BF₃has

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

Covalent compounds are soluble in

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

Which of the following is a polar molecules

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

H-bonding is not present in

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

The bond order in No is 2.5 while that in NO⁺is 3.Which of the following statements is true for these two species?

• Bond length in NO⁺is greater than in NO A
• Bond length in unpredictable B
• Bond length in NO⁺is equal to that in NO C
• Bond length in NO is greater than in NO⁺ D

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

The three N - Hσ-bonds are made by

• sp³- s overlap A
• sp²- s overlap B
• P - p overlap C
• sp - overlap 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

Molecular orbital picture of N₂ indicates

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