AFNS — AFNS Chemistry
Basic Concepts
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#25 Scientific notation 3.2 x 10^4 equals:
A) 32000
B) 3200
C) 320000
D) 32
Answer: A
#27 Valency of oxygen in oxides is usually:
A) 2
B) 1
C) 3
D) 4
Answer: A
#28 Chemical formula of common salt is:
A) NaCl
B) Na2CO3
C) NaOH
D) Na2SO4
Answer: A
#29 AFNS chemistry level is:
A) FSc Pre-Medical
B) Primary only
C) PhD level
D) Arts only
Answer: A
#30 Pure substance has:
A) Fixed composition
B) Variable composition
C) No formula
D) Only dirt
Answer: A
#31 Homogeneous mixture example:
A) Salt solution
B) Sand and iron
C) Oil and water
D) Soil
Answer: A
#32 Heterogeneous mixture example:
A) Sand in water
B) Sugar solution
C) Air
D) Vinegar
Answer: A
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