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.

49 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

49 questions
Question 1 of 9 49 total questions
Question 21
jamb 2010

Elements in the same period in the periodic table have the same?

Anumber of shells
Batomic number
Cchemical properties
Dphysical properties
View Explanation & Discuss
Question 22
jamb 2010

The maximum number of electrons in the L shell of an atom is?

A2
B8
C18
D32
View Explanation & Discuss
Question 23
jamb 2010

The stability of the noble gases is due to the fact that they?

Ahave no electron in their outermost shells
Bhave duplet or octet electron configurations
Cbelong to group zero of the periodic table
Dare volatile in nature
View Explanation & Discuss
Question 24
jamb 2010

How many unpaired electron(s) are there in the nitrogen sub-levels?

A3
B2
C1
Dnone
View Explanation & Discuss
Question 25
jamb 2010

Moving from left to right across a period, the general rise in the first ionization energy can be attributed to the?

Adecrease in nuclear charge
Bincrease in nuclear charge
Cdecrease in screening effect
Dincrease in screening effect
View Explanation & Discuss
Question 26
jamb 2010

The volume of a given gas is V cm\(^3\) at a pressure P mm Hg. what is the new volume of the gas if the pressure is reduced to half at constant temperature?

A4 V cm3
B2 V cm3
CV/2 cm3
DV cm3
View Explanation & Discuss
Question 27
jamb 2010

The droplets of water observed around a bottle of milk taken out of the refrigerator is due to the fact that the?

Awater vapour in the air around the bottle gains some energy from the bottle
Btemperature of the milk drops as it loses heat into the surroundings
Csaturated vapour pressure of the milk is equal to the atmospheric pressure
Dwater vapour in the air around the bottle loses some of its energy to the bottle
View Explanation & Discuss
Question 28
jamb 2010

Calculate the percentage by mass of nitrogen in calcium trioxonitrate (V)
[Ca = 40, N = 14, O = 16]

A8.5%
B13.1%
C17.1%
D27.6%
View Explanation & Discuss
Question 29
jamb 2010

Which of the following is an example of a mixture?

ACommon salt
BBlood
CSand
DWashing soda
View Explanation & Discuss
Question Navigator
Current
MathsFaculty