2003 - JAMB Chemistry Past Questions and Answers - page 5
41
The formula for ethyl butanoate is
A
C3H7COOC2H5
B
C2H5COOC3H7
C
C4H9COOC2H5
D
C2H5COOC4H9
correct option: a
Users' Answers & Comments42
The type of reaction that is peculiar to benzene is
A
addition
B
hydrolysis
C
polymerization
D
substitution
correct option: d
Users' Answers & Comments43
Ethanol reacts with excess acidified K2Cr2O to produce
A
ethanedioic acid
B
ethanal
C
ethylethanoate
D
ethanoic acid
correct option: d
Users' Answers & Comments44
A compound contains 40.0% carbon 6.7% hydrogen and 53.3% oxygen. If the molar mass of the compound is 180, find the molecular formula.
[H = 1, C = 12, O = 16]
[H = 1, C = 12, O = 16]
A
CH2O
B
C3H6O3
C
C6H12O6
D
C6H12O3
correct option: c
C - 40% ; 40/12 = 3.33
H - 6.7% ; 6.7/1 = 6.7
O - 53.3% ; 53.3/16 = 3.33
C = 3.33/3.33 = 1
H = 6.7/3.33 = 2
O = 3.33/3.33 = 1
CH2O
(CH2O)n = 180
(12 + 2 + 16)~n = 180
30n = 180
n = 6
= C6H12O6
Users' Answers & CommentsH - 6.7% ; 6.7/1 = 6.7
O - 53.3% ; 53.3/16 = 3.33
C = 3.33/3.33 = 1
H = 6.7/3.33 = 2
O = 3.33/3.33 = 1
CH2O
(CH2O)n = 180
(12 + 2 + 16)~n = 180
30n = 180
n = 6
= C6H12O6
45
The process by which atoms are rearranged into different molecular structure in the petroleum refining process is referred to as
A
catalytic cracking
B
hydrocracking
C
polymerization
D
reforming
correct option: d
Users' Answers & Comments46
Which of the following is found in cotton
A
Starch
B
Cellulose
C
Fat
D
Oil
correct option: b
Users' Answers & Comments47
The principal constituent of natural gas is
A
methane
B
ethane
C
propane
D
butane
correct option: a
Users' Answers & Comments48
A
L
B
M
C
N
D
P
correct option: b
Users' Answers & Comments