2001 - JAMB Chemistry Past Questions and Answers - page 1
1
25cm3 of a gas X contains Z molecules at 15oC and 75 mmHg. How many molecules will 25 cm3 of another gas Y contain at the same temperature and pressure?
A
2 Y
B
2 Z
C
Z
D
Y
correct option: c
Users' Answers & Comments2
What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen?
[H = 1, O = 16]
[H = 1, O = 16]
A
36.0g
B
8.0g
C
72.0g
D
16.0g
3
A particle that contains 9 protons, 10 neutrons and 10 electrons is a
A
negative ion
B
positive ion
C
neutral atom of non-metal
D
neutral atom of a metal
correct option: a
Users' Answers & Comments4
Cancerous growths are cured by exposure to
A
γ - rays
B
β - rays
C
α - rays
D
x - ray
correct option: d
Users' Answers & Comments5
An oxide XO2 has a vapour density of 32. What is the atomic mass of X?
A
32
B
20
C
14
D
12
6
Millikan's contributions to the development of atomic theory is the determination of
A
charge on electron
B
positive rays
C
charge to mass ratio
D
cathode rays
correct option: a
Users' Answers & Comments7
Four elements W, X, Y and Z have atomic number 2,6,16 and 20 respectively. Which of these elements is a metal?
A
X
B
W
C
Z
D
Y
correct option: c
Users' Answers & Comments8
An elements X with relative atomic mass 16.2 contains two isotopes 168X with relative abundance of 90% and m8X with relative abundance of 10%. The value of m is
A
16
B
18
C
12
D
14
correct option: b
168X, m8X
16 * (90/100) + m * (10/100) = 16.2
1440 + 10m = 1620
10m = 180
m = 18
Users' Answers & Comments16 * (90/100) + m * (10/100) = 16.2
1440 + 10m = 1620
10m = 180
m = 18
9
Which of the following statements is correct about the average kinetic energy of the molecules of a gas?
A
It increase with increase in pressure
B
It increase at constant temperature
C
It increase with increase in temperature
D
It increase with increase in volume
correct option: c
Users' Answers & Comments10
The pollution from petroleum spillage in rivers and lakes can best be dispersed by
A
Pouring detergents
B
Passing of ships through the area
C
Pouring organic solvents
D
Evaporation
correct option: a
Users' Answers & Comments