AFNS — AFNS Chemistry
Basic Concepts
Page 1 of 5
#1 Avogadro's number is approximately:
A) 6.02 x 10^23
B) 3.14 x 10^10
C) 9.8 x 10^2
D) 1.6 x 10^-19
Answer: A
#2 Mole is SI unit of:
A) Mass
B) Amount of substance
C) Volume
D) Temperature
Answer: B
#3 Empirical formula shows:
A) Actual structure
B) Simplest ratio of atoms
C) Molecular mass only
D) Color
Answer: B
#4 Isotopes have same:
A) Mass number
B) Atomic number
C) Neutrons always
D) Density always
Answer: B
#5 Cathode rays are:
A) Protons
B) Electrons
C) Neutrons
D) Alpha particles
Answer: B
#6 pH of pure water at 25C is:
A) 0
B) 7
C) 14
D) 1
Answer: B
#7 Oxidation involves:
A) Gain of electrons
B) Loss of electrons
C) No change
D) Gain of protons
Answer: B
Page 1 of 5
Register or Login for comments
Comments: