1990 - JAMB Chemistry Past Questions and Answers - page 3
21
The label on a reagent bottle containing a clear organic liquid dropped off.The liquid was neutral to litmus and gave a colourless gas with metallic sodium. The liquid must be an?
A
alkanoate
B
alkaene
C
alkanol
D
alkane
correct option: c
Users' Answers & Comments22
Alkaonic acids have low volatility compared with alkanols because they?
A
are more polar than alkaonls
B
have two oxygen atoms while alkanols have one
C
form hydrogen bonds while alkanols do not
D
form two hydrogen bonds while alkanols form one
correct option: d
Users' Answers & Comments23
The octane number of a fuel whose performance is the same as that of a mixture of 55 g of 2,2,4- trimethly pentane and 45 g of n-heptane is ?
A
45
B
55
C
80
D
100
correct option: b
Users' Answers & Comments24
Which of the following is formed when maltose reacts with concentrated tetraoxosulphate (VI) acid ?
A
Carbon (IV) oxide
B
Coal tar
C
Charcoal
D
Toxic fumes
correct option: c
Users' Answers & Comments25
If a gas occupies a container of volume 146 cm3 at 18°C and 0.97`atm, its volume 146cm3 at s.t.p is?
A
133
B
146
C
266
D
292
correct option: a
V1 = 146cm3 T1 = 273 + 118 = 291 k
P1 = 0.971 atmosphere
V2 = ? T2 = 273K P2 = 1 atom
V2 = (0.971 atom χ 146cm3 χ 273k)/(1atm χ 291k) = 132997 0r = 133cm3
Users' Answers & CommentsP1 = 0.971 atmosphere
V2 = ? T2 = 273K P2 = 1 atom
V2 = (0.971 atom χ 146cm3 χ 273k)/(1atm χ 291k) = 132997 0r = 133cm3
26
The volume occupies by 1.58g of a gas at s.t.p is 500cm3. What is the relative molecular mass of the gas?
(G.M.V at s.t.p = 22.40dm3)
(G.M.V at s.t.p = 22.40dm3)
A
28
B
32
C
44
D
71
correct option: d
500cm3 = 1.58g
=22400cm = (1.58g)/(500cm3) χ 22400cm3) = 70.78 g
= 71g
Users' Answers & Comments=22400cm = (1.58g)/(500cm3) χ 22400cm3) = 70.78 g
= 71g
27
Equal volumes of CO,SO2, and H2S were released into a room at the same point and time. Which of the following gives the order of diffusion of the gases to the opposite corner of the room?
(S = 32, C = 12, O = 16, N = 14, H = 1)
(S = 32, C = 12, O = 16, N = 14, H = 1)
A
CO, SO2,NO2,H2S
B
SO2,NO2,H2S,CO
C
CO,H2S,SO2,NO2
D
CO,H2S,NO2,SO2
correct option: d
Users' Answers & Comments28
A basic postulate of the kinetic theory of gases is that the molecules of a gas move in straight lines between collisions. This implies that?
A
collisions are perfectly elastic
B
forces of repulsion exist
C
forces of repulsion are in equilibrium
D
collision are inelastic
correct option: a
Collisions between gas particles or collisions with the walls of the container are perfectly elastic. None of the energy of a gas particle is lost when it collides with another particle or with the walls of the container.
Users' Answers & Comments29
.....................P....Q.....R......S
Proton..............13....16....17.....19
Electron............13....16....17.....19
Neutron.............14....16....35.....20
Which of the four atoms P,q,R and in S in the above data can be described by the following properties relative atomic mass is greater than 30 but less than 40; it has an odd atomic number and forms a unipositive ion in solution?
Proton..............13....16....17.....19
Electron............13....16....17.....19
Neutron.............14....16....35.....20
Which of the four atoms P,q,R and in S in the above data can be described by the following properties relative atomic mass is greater than 30 but less than 40; it has an odd atomic number and forms a unipositive ion in solution?
A
P
B
Q
C
R
D
S
correct option: d
Users' Answers & Comments30
Which of the following terms indicates the number of bonds that can be formed by an atom?
A
Oxidation number
B
Valence
C
Atomic number
D
Electronegativity
correct option: b
Users' Answers & Comments