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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#89 Hund's rule is not followed in the electronic configuration of:
A) Carbon
B) Nitrogen
C) Beryllium
D) None
#90 A compound containing 10% carbon by mass. The least molecular mass is
A) 120
B) 160
C) 200
D) 220
#91 Electrons occupy degenerate orbitals singly with parallel spins before pairing. This is:
A) Aufbau principle
B) Pauli rule
C) Hund rule
D) Dalton law
#92 For a given energy sub-level, the total values of magnetic quantum number are:
A) n - 1
B) 2l + 1
C) 4l + 2
D) None
#93 The total number of atoms represented by the compound CuSO4 . 5H20 is
A) 27
B) 21
C) 5
D) 8
#94 Orbitals are filled in order of increasing energy. This is:
A) Aufbau principle
B) Hund rule
C) Pauli principle
D) Le Chatelier principle
#95 No two electron can have same spin in an orbital. This is:
A) Hund's rule
B) Pauli Exclusion Principle
C) Aufbau rule
D) None of these
#96 Which of the following compounds contains the highest % by mass of nitrogen?
A) NH3
B) N2H4
C) Urea (NH2)2CO
D) NO2
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