Free MCQs & Online Quiz Practice for Exams

Q: Bohr's theory cannot be applied on

A) H

B) H⁺¹

C) He⁺¹

D) Li⁺²

Q: Which of the following sets of quantum numbers are not possible?

A) n=3, l=2, m=0, s=−½

B) n=3, l=3, m=−3, s=+½

C) n=4, l=3, m=−3, s=+½

D) n=3, l=1, m=0, s=−½

Q: The frequency of a green light is 6×10¹⁴ Hz; its wavelength is

A) 5nm

B) 500nm

C) 5000nm

D) 100nm

Q: Which of the following sub-shells do not exist?

A) 1p

B) 5d

C) 6f

D) 1s

Q: All quantum numbers are obtained from the solution of Schrödinger equation except

A) Principal quantum number

B) Magnetic quantum number

C) Spin quantum number

D) Azimuthal quantum number

Q: The maximum number of electrons in a 3s orbital is

A) 1

B) 2

C) 6

D) 10

Q: The splitting of spectral lines in a magnetic field is called

A) Stark effect

B) Zeeman effect

C) Aufbau principle

D) Pauli exclusion principle

Q: If the mass of electron is reduced to half, the Rydberg constant

A) Becomes half

B) Becomes double

C) Remains unchanged

D) Becomes one fourth

Q: Which element has the electronic configuration (noble-gas notation) [Kr] 5s² 4d²

A) Se

B) Sr

C) Zr

D) Mo

Q: The mathematical form of Moseley's law is

A) √ν = b (Z − a)

B) √ν = k (Z − b)

C) √ν = a/b √ Z

D) √ν =b/z (z)

Q: The head-on overlap of p-orbitals of two atoms gives rise to a bond called

A) Sigma bond

B) Pi (π) bond

C) Ionic bond

D) Metallic bond

Q: Which one of the following molecules has a pyramidal structure?

A) CH₄

B) NH₃

C) H₂O

D) C₂H₄

Q: Specie in which the central atom uses sp² hybrid orbitals in its bonding is

A) PH₃

B) NH₃

C) CH₃

D) SbH₃

Q: On the basis of VSEPR theory, a molecule with three bond pairs and one lone pair of electrons will have a structure

A) Linear

B) Trigonal planar

C) Tetrahedral

D) Trigonal pyramidal

Q: Which of the following is an example of a network solid?

A) Sugar

B) Graphite

C) Carbon dioxide, CO₂(s)

D) Magnesium fluoride, MgF₂(s)

Q: All are true for π-bond except

A) π-bond is formed from sp-hybrid orbitals

B) π-bond is formed by the parallel overlap of half-filled p-orbitals

C) π-bond is formed when a sigma bond is already present

D) π-bond is weaker than sigma bond

Q: Which one of the following molecules has zero dipole moment?

A) NH₃

B) NF₃

C) BF₃

D) H₂O

Q: The bond angle in water H₂O is

A) 90°

B) 109.5°

C) 180°

D) 104.5°

Q: Which one of the following compounds has the highest ionic character?

A) HF

B) HCl

C) HBr

D) HI

Q: Liquid oxygen is

A) Diamagnetic

B) Paramagnetic

C) Antimagnetic

D) Ferromagnetic