Chemistry Top 100 Repeated MCQs
MDCAT · NUMS · FSc · Entry Test — most asked Chemistry questions with answers
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These Chemistry MCQs are picked from high-yield FSc chapters and mix sets — the kind of questions that appear again and again in MDCAT, NUMS, and board exams. Use page navigation below to practice all 100 MCQs, then try the Chemistry mock test.
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#1 The correct outer electronic configuration of chromium (Z = 24) is:
A) 4s1 3d5
B) 4s2 3d4
C) 4s3 3d6
D) None
#2 How many numbers of atoms are there in 46 amu of sodium?
A) 3
B) 4
C) 2
D) 2.5
#3 Which subatomic particle carries a positive charge?
A) Proton
B) Electron
C) Neutron
D) Positron
#4 What is the main characteristic of covalent bonding?
A) Transfer of electrons
B) Sharing of electrons
C) Attraction between oppositely charged ions
D) Formation of crystals
#5 The Aufbau Principle states that
A) Only two electrons can occupy an orbital
B) Electrons enter the lowest available energy level
C) Electrons tend to occupy empty orbitals and avoid pairing
D) Orbitals are regions where probability of finding electrons is maximum
#6 How many numbers of molecules are there in 8 amu of hydrogen gas?
A) 2
B) 2.5
C) 3.5
D) 4
#7 Atomic number Z equals the number of:
A) Neutrons
B) Protons
C) Electrons in all atoms
D) Nucleons
#8 Which of the following is a correct example of covalent bonding?
A) NaCl
B) H2O
C) MgO
D) CaCl2
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