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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#65 In which one of the following species the central atom is sp2 hybridized?
A) SO2
B) BF3
C) CH3+
D) All
#66 The volume of SO2 (STP) is given off on heating 9.7g of ZnS ?
2ZnS + 3O2 → ZnO + 2SO2
A) 22.4 dm3
B) 2.24 dm3
C) 0.0224 dm3
D) 44.8 dm3
#67 The azimuthal quantum number l determines the orbital:
A) Size
B) Shape
C) Orientation
D) Spin
#68 Which theory explains the formation of covalent bonds by sharing electrons between atoms?
A) Valence Bond Theory
B) Molecular Orbital Theory
C) VSEPR Theory
D) Octet Rule
#69 Which of the following has greatest bond energy?
A) O2
B) N2
C) H2
D) All
#70 How many moles of oxygen are needed for the complete cumbustion of 2 mole of methene (CH4) ?
A) 2.5 mole
B) 3.5 mole
C) 4 mole
D) 4.5 mole
#71 The magnetic quantum number m indicates the:
A) Spin of electron
B) Shape of orbital
C) Orientation of orbital
D) Size of orbital
#72 In which of the following molecules does the central atom undergo sp3 hybridization?
A) CO2
B) CH4
C) SO2
D) NF3
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