Chemistry Past Questions

Study and practice Chemistry past questions with answers and detailed explanations. Then test your knowledge using our interactive CBT practice platform and prepare confidently for your upcoming examinations.

4,306 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
Download PHP app Ask a Question Check Syllabus Past Question Videos Topic Video Lessons

Take a test

Past Questions

4,306 questions
Question 1 of 20 4,306 total questions
Question 1271
jamb 2003

The weakest attractive force that can be observed between two molecules is

Aionic
Bcovalent
Ccoordinate covalent
Dvan der Waals
View Explanation & Discuss
Question 1272
jamb 2003

When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes

Anegatively charged
Bpositvely charged
Cneutral
Dbipolar
View Explanation & Discuss
Question 1273
jamb 2003

A gas exerts pressure on its container because

Asome of its molecules are moving faster than others
Bof the collision of the molecules with each other
Cof the mass of the molecules of gas
Dthe molecules of a gas collide with the walls of the container
View Explanation & Discuss
Question 1274
jamb 2003

I. H = 1S\(^1\) II. N = 1S\(^2\) 2S\(^2\)2P\(^3\)  III. O = 1S\(^2\) 2S\(^2\) 2P\(^4\) IV. Zn = 1S\(^2\) 2S\(^2\) 2P\(^6\) 3S\(^2\) 3P\(^6\) 4S\(^2\) 3d\(^{10}\)
From the above, which of the following pairs is like to be paramagnetic?

AI and II
BI and III
CI and IV
DIII and IV
View Explanation & Discuss
Question 1275
jamb 2003

According to the kinetic theory, an increase in temperature causes the kinetic energy of particles to

ADecrease
BIncrease
CRemain constant
DBe zero
View Explanation & Discuss
Question 1276
jamb 2003

The noble gases owe their inactivity to

AOctet configuration
BCyclic shape
CHexagonal shape
DObtuse configuration
View Explanation & Discuss
Question 1277
jamb 2003

Neutral atoms of neon with atomic number 10 have the same number of electron as

AO2+
BCa2+
CK+
DMg2+
View Explanation & Discuss
Question 1278
jamb 2003

3Cu + pHNO3 →3Cu(NO)2 + 4H2 O + xNO
In the equation above, the values of p and x respectively are

A1 and 3
B2 and 3
C6 and 2
D8 and 2
View Explanation & Discuss
Question 1279
jamb 2003

The filter in the cigarette reduces the nicotine content by

ABurning
BAdsorption
CEvaporation
DAbsorption
View Explanation & Discuss
Question 1280
jamb 2003
What is the percentage by mass of oxygen in Al2(SO4)3. 2H2O?
[Al = 27, S = 32, H = 1, O = 16]
A14.29%
B25.39%
C50.79%
D59.25%
View Explanation & Discuss
Question 1281
jamb 2003

Which of the following is physical change?

ABurning kerosene
BFreezing ice cream
CExposing white phosphorus
DDissolving calcium in water
View Explanation & Discuss
Question 1282
jamb 2003
What volume of oxygen is produced from the decomposition of 2 mole of KCIO3 at s.t.p?
[Molar volume of a gas at s.t.p = 22.4 dm3]
A22.4 dm3
B33.6 dm3
C44.8 dm3
D67.2 dm3
View Explanation & Discuss
Question 1283
waec 2002
One of the methods used for combating air pollution is
Aburning of solid waste
Bprovision of sanitary land fills
Clegislation against some industrial practices
Dscavenging of refuse dumps
View Explanation & Discuss
Question 1284
waec 2002
Iron is often galvanized in order to
Amake it more malleable
Bremove the impurities in it
Cprotect it against corrosion
Drender it passive
View Explanation & Discuss
Question 1285
waec 2002

The energy value of petrol can be determined by a

Abomb calorimeter
Bcatalytic cracker
Cfractionating column
Dthermometer
View Explanation & Discuss
Question 1286
waec 2002
The reaction of sucrose with dilute HCI produces
Aan alkanoate
Bglucose and fructose
Ca black mass of carbon
Da polysaccharide
View Explanation & Discuss
Question 1287
waec 2002
A suitable reagent for distinguishing between ethanoic acid ethanol is
Abromine water
BFehling's solution
Csodium hydrogentrioxocarbonate (IV)
Dammoniacal silver trioxonitrate (V)
View Explanation & Discuss
Question 1288
waec 2002

Which of the following types of alkanols undergo oxidation to produce alkanoic acids? I. Primary alkanols  II. Secondary alkanols III. Tertiary alkanols

AI,II and III
Bl and ll only
Cll only
Dl only
View Explanation & Discuss
Question 1289
waec 2002
Which of the following statements about soapless detergents is correct? They
Alather readily with hard water
Bincrease the surface tension of water
Ccause hydrolysis of salts in water
Dfrom a curdy precipitate with soft water
View Explanation & Discuss
Question 1290
waec 2002
The reaction between ethene and chlorine to form 1, 2-dichloroethane is
Aoxidation
Bpolymerization
Caddition
Dsubstitution
View Explanation & Discuss
Question Navigator
Current
MathsFaculty