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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#81 Two different hydrocarbons each contains the same percentage by mass of hydrogen it means that they have the same
A) number of atoms
B) empirical formula
C) number of isomer
D) relative molecular mass
#82 Total orbitals in a shell are given by:
A) n^2
B) 2n^2
C) 4l + 2
D) 2n
#83 The simplest canal rays are:
A) Neutrons
B) Electrons
C) Protons
D) All
#84 The limiting reagent in a chemical reaction is one that:
A) Has the largest molar mass (formula weight).
B) Has the smallest molar mass (formula weight).
C) Has the smallest coefficient.
D) is consumed completely
#85 Maximum number of electrons in a shell equals:
A) n^2
B) 2n^2
C) 2n
D) 4n
#86 The quantum number that is not derived from Schrodinger wave equation is:
A) Principal quantum number
B) Spin quantum number
C) Azimuthal quantum number
D) Magnetic quantum number
#87 The equation for burning of hydrogen is
2H2 + O2 → 2H2O
One mole of hydrogen gas is mixed with 1 mole of oxygen gas and brunt
A) 1 mole of steam
B) 1 mole of steam and 0.5 mole of oxygen gas
C) 2 mole of steam only
D) 2 mole of steam and 0.5 mole of hydrogen
#88 No two electrons in an atom can have the same set of four quantum numbers. This is the:
A) Hund rule
B) Pauli exclusion principle
C) Aufbau principle
D) Octet rule
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