Category: Chemistry Basic Concept

A. 0.2m
B. 0.2mm
C. 0.2nm
D. 0.2pm

A. Relative abundance
B. Average mass of element
C. Number of isotopes
D. Relative isotopic mass

A. Pb3 O4
B. 2Pb CO3 – Pb (OH)2
C. Pb Cr O4 – Pb (OH)2
D. Pb2O

A. Electrons fill orbitals with parallel spins until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel (opposite) spin.
B. The electrons in the same atom cannot have the same four quantum numbers
C. There is maximum of two electrons is an orbital.
D. None

A. 1-mole molecules of water
B. 1-gram molecule of water
C. 3-gram atoms
D. all

A. Quantum structure
B. Secondary structure
C. Tertiary structure
D. Primary structure

A. aluminium can be recycled
B. aluminium has very low density
C. aluminium is the most abundant metal in the earth crust
D. aluminium is resistant to corrosion by organic acids.

A. oxygen
B. carbon
C. tin
D. chlorine

A. dilute and concentrated
B. dilute and saturated
C. saturated and unsaturated
D. saturated and super saturated

A. 0.18 mole
B. 0.27 mole
C. 0.24 mole
D. 0.09 mole