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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#25 No. of moles of oxygen molecules in 0.5 moles of Al2(SO4)3:
A) 6
B) 3
C) 12
D) 4
#26 1 amu is equivalent to
A) 1.66 x 10-24 g
B) 1.66 x 10-27 kg
C) 1.66 x 10-21 mg
D) All of the above
#27 Who proposed the plum pudding model of atom?
A) J J Thomson
B) Rutherford
C) Bohr
D) Dalton
#28 In which of the following molecules does the central atom undergo sp2 hybridization?
A) CH4
B) SO2
C) CO2
D) NH3
#29 Which of the following mass has greatest number of moles?
A) 10g of NaOH
B) 10g of glucose
C) 4g of He
D) 50g of CaCO3
#30 Avagadro 's number represents the number of atoms in ?
A) 12g of C12
B) 320g of sulphur
C) 32g of oxygen
D) 12.7g of iodine
#31 Rutherford used a beam of which particles in the gold foil experiment?
A) Beta particles
B) Gamma rays
C) Alpha particles
D) Neutrons
#32 Which of the following elements typically form double bonds in covalent compounds?
A) Hydrogen
B) Oxygen
C) Nitrogen
D) Carbon
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