Category: Chemistry Basic Concept

A. 80%
B. 30%
C. 40%
D. 20%

A. 6.022 x 1023 atoms of oxygen
B. 22-gram electrons
C. 6.022 x 1023 atms of carbon
D. both B. & C.

A. properties which depend upon mass
B. arrangement of electrons in orbitals
C. chemical properties
D. all of the above

A. mass of an atom itself is in fraction
B. atomic masses are average masses of isobars
C. atmoic masses are average masses of isotopes proportional to their relative abundance
D. atmoic masses are average masses of isotopes

A. relative atomic mass
B. mass number
C. atomic weight
D. relative isotopic mass

A. 6
B. 4
C. 3
D. 2

A. 2.24 dm3
B. 22.4 dm3
C. 1.12 dm3
D. 112 dm3

A. 1.008 x 10-3
B. 5.5 x 10-4
C. 1.84 x 10-4
D. 1.673 x 10-3

A. they possess different mass number
B. they possess different physical properties
C. they possess same chemical properties
D. they possess different position in the periodic table

A. Gas
B. Liquid
C. Volatile solid
D. All