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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#9 Which of the following ions contains 5 unpaired electrons?
A) Cr3+
B) Fe3+
C) Mn2+
D) b and c both
#10 The atomic mass of an element is measured relative to the mass of
A) Hydrogen atom
B) Oxygen atom
C) carbon -12
D) Isotopic Mixture of 12C, 13C and 14C
#11 Mass number A is equal to:
A) Protons + neutrons
B) Protons + electrons
C) Electrons + neutrons
D) Protons only
#12 According to VSEPR theory, the shape of the CH4 molecule is?
A) Tetrahedral
B) Linear
C) Trigonal planar
D) Bent
#13 The number of hybridized orbitals in sp hybridized carbon atom is
A) 1
B) 2
C) 3
D) 4
#14 How many amu are there in 16g of oxygen?
A) 9.63 x 1024
B) 1.602 x 1025
C) 6.12 x 1022
D) 1.64 x 1023
#15 Isotopes of an element have the same:
A) Number of neutrons
B) Mass number
C) Atomic number
D) Number of nucleons
#16 Which of the following statements is true about the bond angles in a water (H2O) molecule?
A) Bond angles are 180 degrees
B) Bond angles are 109.5 degrees
C) Bond angles are 104.5 degrees
D) Bond angles are 90 degrees
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