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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#73 Dipole moment is ______ quantity.
A) Vector
B) Scalar
C) Tensor
D) None
#74 How many moles of oxygen are produced when 3 mol of KCIO3 decompose completely?
2KCIO3 → 3KCI + 3O2
A) 1 mol
B) 2 mol
C) 2.5 mol
D) 4.5 mol
#75 The spin quantum number has possible values of:
A) +1 and -1
B) 0 only
C) +1/2 or -1/2
D) Any real number
#76 Which of the following molecules has a trigonal bipyramidal geometry?
A) PH3
B) AsF5
C) CH4
D) SO2
#77 W.O.F is ionic in nature?
A) HF
B) NaCl
C) HCl
D) All
#78 One mole of butane has the same
A) number of carbon atoms as one of C2H6
B) number og molecules as one mole of CH4
C) Mass as half a mole of hexane
D) number of hydrogen atoms as one mole of C3H8
#79 The number of orbitals in a subshell equals:
A) n
B) 2n
C) 2l + 1
D) n + l
#80 Canal rays move in the direction of:
A) Cathode to anode
B) Anode to cathode
C) In random direction
D) They do not move
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