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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#33 Vol. of H2 gas required to produce 0.1 moles of HCl at STP H2 + Cl2 -> 2HCl
A) 11.2 L
B) 1.12 L
C) 1.12 mL
D) 0.56 L
#34 The total numbers of protons, electrons and neutrons in 12g of C - 12is :
A) 2.88 x 1025
B) 6.022 x 1023
C) 6.022 x 1022
D) 18
#35 The nucleus of the atom was discovered by:
A) Millikan
B) Rutherford
C) Bohr
D) Thomson
#36 Which of the following is an example of a molecule with a trigonal planar shape?
A) H2O
B) CO2
C) BF3
D) NH3
#37 Which one is limiting reagent, if 3.5 mL of H2 and 3.5 mL of Cl2 react to produce HCl? H2 + Cl2 -> 2HCl
A) Cl2
B) H2
C) Both A & B
D) None
#38 Which has maximum number of atoms?
A) 24g of C (12)
B) 56g of Fe (56)
C) 27g of Al (27)
D) 108g of Ag(108)
#39 According to Bohr, electrons revolve in:
A) Random paths
B) Discrete energy levels
C) Elliptical clouds
D) Inside the nucleus
#40 In the nitrogen trifluoride (NF3) molecule, the central atom undergoes which type of hybridization?
A) sp
B) sp2
C) sp3
D) sp3d
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