2002 - JAMB Chemistry Past Questions and Answers - page 5
41
The processes which return carbon (IV) oxide to the atmosphere include
A
respiration, decay and combustion
B
photosynthesis, respiration and transpiration
C
ozone depletion, combustion and decay
D
photosynthesis, decay and respiration
correct option: a
Users' Answers & Comments42
The postulate of Dalton's atomic theory which still holds is that
A
atoms can neither be created nor destroyed
B
the particles of the same element are exactly alike
C
particles of different elements combine in simple whole number ratio
D
all elemets are made of small indivisible particles
correct option: a
Postulates of Dalton’s atomic theory can used to explain the behavior of matter:
All matter is composed of small tiny particles called atoms. In Greek the word atom is termed as indivisible. The atoms can not be further broken down.
All atoms are indivisible, indestructible, and unchangeable. Atom of an element cannot be created, divided, destroyed, or split into smaller particles or transformed into atoms of other elements or transformed into other atoms in a chemical reaction. They are simply rearrangement of new compound. Dalton’s atomic theory based this hypothesis on the law of conservation of mass and on centuries of experimental evidence.
Users' Answers & CommentsAll matter is composed of small tiny particles called atoms. In Greek the word atom is termed as indivisible. The atoms can not be further broken down.
All atoms are indivisible, indestructible, and unchangeable. Atom of an element cannot be created, divided, destroyed, or split into smaller particles or transformed into atoms of other elements or transformed into other atoms in a chemical reaction. They are simply rearrangement of new compound. Dalton’s atomic theory based this hypothesis on the law of conservation of mass and on centuries of experimental evidence.
43
146C → X + B
X in the equation above represents
X in the equation above represents
A
126C
B
125B
C
147N
D
136C
44
If 0.75 mole of cyclopropane and 0.66 mole of oxygen are mixed in vessel with a total pressure of 0.7 atmosphere, what is the partial pressure of oxygen in the mixture
A
0.44 atmosphere
B
0.22 atmosphere
C
0.55 atmosphere
D
0.33 atmosphere
correct option: d
Users' Answers & Comments45
A
R
B
P
C
S
D
Q
correct option: b
Users' Answers & Comments46
A
A
B
B
C
C
D
D
correct option: a
Users' Answers & Comments47
A
glycol
B
primary alkanol
C
secondary alkanol
D
tertiary alkanol
correct option: c
Users' Answers & Comments