Question 4
WAEC
•
2025
•
CHEMISTRY
•
essay
Answer all the questions in this section.
Question Parts
(
a
)
State Dalton's law of partial pressure.
(
b
)
A cylinder contains 2 moles of \( \mathrm{O}_{2}, 3 \) mole of \( \mathrm{CO}_{2} \) and 5 moles of \( \mathrm{N}_{2} \) at a particular temperature. If the pressure in the cylinder is \( 210 \mathrm{Nm}^{-2} \), calculate the partial pressure of \( \mathrm{O}_{2} \) and \( \mathrm{N}_{2} \).
(
c
)
Define the term concentration of a solution.
(
d
)
Calculate the mass concentration of \( 0.10 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{Na}_{2} \mathrm{CO}_{3} \left[\mathrm{Na}_{2} \mathrm{CO}_{3}=106\right] \).
(
e
)
Describe how a \( 1 \, ext{dm}^{3} \) solution of 0.1 mol \( d m^{-3} \mathrm{Na}_{2} \mathrm{CO}_{3} \) could be prepared.
(
f
)
State two physical properties of each of the following substances: Chlorine; Hydrogen chloride.
(
g
)
State what would be observed when burning splint of hydrogen is introduced into a gas jar containing chlorine.
(
h
)
Consider the following gases: \( \mathrm{CO}_{2} ; \mathrm{HCl} \) and \( \mathrm{CH}_{4} \).
(
i
)
State one industrial use of hydrogen chloride gas.
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About This Question
This is
Waec
2025
Chemistry
Question 4.
It is one of the
essay
questions from the
2025
Waec
Chemistry
examination.
The question covers
General
.