Formula of Galena is________?

A. PbS
B. HgS
C. AS2S3
D. FeS2

Submitted by: Muhammad Ali Kunbhar

A compound is determined to have an emperical formula of C2H6O and a molar mass of 138 g/mole. What is the molecular formula?
A. C2H6O
B. C6H18O3
C. C6H12O6
D. C2H5O
Submitted by: Muhammad Ali Kunbhar
A substance is analyzed and found to have an emperical formula of CH2 and a molar mass of 56g/mole. What is the molecular formula of the compound?
A. C2H4
B. C3H6
C. C4H8
D. C5H10
Submitted by: Muhammad Ali Kunbhar
The average salinity of sea water is________?
A. 3%
B. 3.5%
C. 2.5%
D. 2%
Submitted by: Muhammad Ali Kunbhar
A process used for the Concentration of Ore is________?
A. Roasting
B. Forth flotation
C. Electrolysis
D. Distillation
Submitted by: Muhammad Ali Kunbhar
Basicity of orthophosphoric acid is________?
A. 2
B. 3
C. 4
D. 5
Submitted by: Muhammad Ali Kunbhar
Percentage of lead in lead pencil is________?
A. Zero
B. 20
C. 80
D. 70
Submitted by: Muhammad Ali Kunbhar
Water molecule is________?
A. V-shaped
B. Angular
C. Pyramidal
D. Triangular planer
Submitted by: Muhammad Ali Kunbhar
The Bond Energy of H-F is________?
A. 456kJ/mol
B. 562kJ/mol
C. 281kJ/mol
D. None
Submitted by: Naintara Mustafa
Aldehyde and ketone have same general formula for homologous series_________________?
A. CnH2nO2n
B. CnH2n
C. CnH2nO
D. CnH2nOn+1
What is the Chemical formula of Zinc Hydroxide _________ ?
A. Zn(OH)2
B. ZNO2
C. Zn2(OH)3
D. ZnOH
Submitted by: Rashid Mehmood