AFNS — AFNS Chemistry
Basic Concepts
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#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
#8 Valency of oxygen is usually:
A) 1
B) 2
C) 3
D) 4
Answer: B
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