Practice Pakistan's most useful MCQs for competitive exams

Molecular orbitals are filled according to _________________?

• (A)  Auf bau principle
• (B)  Hunds rule
• (C)  Paulis Exclusion principle
• (D)  All these

Answer

Submitted By :Ali Uppal

Which one has maximum number of unpaired electrons ?

• (A)  6X
• (B)  7Y
• (C)  9Z
• (D)  13W

Answer

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Shielding effect across the period ________________?

• (A)  Increases
• (B)  Decreases
• (C)  Constant
• (D)  None

Answer

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Product of charge and distance is called__________________?

• (A)  Pressure
• (B)  Bond length
• (C)  Work
• (D)  Dipole moment

Answer

Submitted By :Ali Uppal

Unpaired electron in a molecule gives ______________ character ?

• (A)  Ferromagnetic
• (B)  Paramagnetic
• (C)  Diamagnetism
• (D)  Both A & B

Answer

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According to VESPR Model the geometry of molecule having 5 bond pair in outer most shell will be __________________?

• (A)  Triangular
• (B)  Square planner
• (C)  Trigonal bipyramidal
• (D)  Octahedral

Answer

Submitted By :Ali Uppal

Geometry of molecule will be pyramidal if the outer post shell of the central atom has___________________?

• (A)  3 bond pair one lone pair
• (B)  2 bond pair 2 lone pair
• (C)  1 bond pair 3 lone pair
• (D)  3 lone pair 1 bond pair

Answer

Submitted By :Ali Uppal

Orbitals of same energy produced after mixing of orbitals of different energy are called __________________?

• (A)  Degenerate orbitals
• (B)  Generate orbitals
• (C)  Hybrid orbitals
• (D)  Zeeman orbitals

Answer

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Sharing of 1 electron pair by one specie forms_________________?

• (A)  Single covalent bond
• (B)  Hydrogen bond
• (C)  Double covalent bond
• (D)  Coordinate covalent bond

Answer

Submitted By :Ali Uppal

Which one of the following has polar covalent bond ?

• (A)  HF
• (B)  CH4
• (C)  H2
• (D)  N2

Answer

Submitted By :Ali Uppal