Chemistry MCQs

Explore an extensive collection of Chemistry MCQs covering all key topics of Chemistry Mcqs are including organic chemistry, inorganic chemistry, physical chemistry, atomic structure, chemical bonding, stoichiometry, thermodynamics, kinetics, acids and bases, periodic table, and more. Perfect for students preparing for board exams, competitive tests, and university-level assessments in Pakistan

Chemistry MCQs

moles of each aluminium and oxygen react with each other to produce aluminium oxide. The amount of product formed is______________________?

A. 0.18 mole

B. 0.27 mole

C. 0.24 mole

D. 0.09 mole

Which of the following terms is not used for ionic compound ?

A. formula unit

B. empirical formula

C. molecular formula

D. formula mass

The number of isotopes of elements with even mass number and even atomic number are ________________?

A. 280

B. 300

C. 154

D. 54

One mole of CO2 contains?

A. 6.022 x 1023 atoms of oxygen

B. 22-gram electrons

C. 6.022 x 1023 atms of carbon

D. both B. & C.

Which of the following statements about isotopes is correct ?

A. Isotopes with odd atomic number are abundant

B. Isotopes with odd atomic number and even mass number are abundant

C. Isotopes with even atomic number and even mass number are abundant

D. Isotopes with even atomic number and odd mass no are abundant

Molecular mass of water (18g) means__________________?

A. 1-mole molecules of water

B. 1-gram molecule of water

C. 3-gram atoms

D. all

Empirical formula of chloroform is____________________?

A. CH2 C12

B. CH3C1

C. CC14

D. CHCL3

The number of peaks obtained in mass spectrometry shows____________________?

A. Relative abundance

B. Average mass of element

C. Number of isotopes

D. Relative isotopic mass

Mass spectrometer is used to determine Mass number of isotopes and___________________?

A. Atomic number

B. Relative abundance

C. Electronic configuration

D. All of the above

Diameter of an atom is in the order of________________?

A. 0.2m

B. 0.2mm

C. 0.2nm

D. 0.2pm

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