Cameroon GCE ordinary level June 2025 chemistry 1
Cameroon GCE ordinary level June 2025 chemistry 1
Identify the change from solid to liquid.
A Evaporation
Condensation
C Sublimation
D Melting
Questions 8– 10(3 Questions)
INSTRUCTIONS: ONE or MORE of the response(s)
numbered 1– 4 is (are) correct. Decide which
response(s); is (are) correct: Then choose.
Then choose.
A: if only 1, 2 and 3 are correct
B: if 1 and 3 are correct
C: if only 2 and 4 are correct
D: if only 4 is correct.
B
2. Why are sodium hydroxide pellets stored in
tightly closed containers?
A To prevent it from turning to solution
B To prevent it from reacting with oxygen
C To prevent it from reacting with an acid
D To prevent it from losing water of
crystallization
Instructions summarised
| A 1, 2, 3 only |
B | C | D |
1, 3 only 2, 4 only 4 only
Calculate the concentration of dilute
hydrochloric acid (HC1), if 20cm3 of it was
used to neutralize 25cm3 of O.IM sodium
carbonate (Na2C03) solution.
| Na2C03(aq) + 2HCl(aq) C02(g) |
2NaCl(aq) + H20 + |
A 0.01 moldin‘3
B 0.13 moldm‘3
C 0.25 moldm‘3
D 0.40 moldm’3
Which of the following is(are) redox
reaction(s)?
1 NaOH(aq) + HC1
J. 8.
NaCl(aq) + H20(g)
2 CuS04(aq)+ BaCl2(aq)—*BaS04(S) + CuCl2(aq)
3 Ag N03(aq) + NaCl(aq)— AgCl(S)+NaN03(aq)
4 CuO(S +) H2g
Cu(S) + H20(g)
For an exothermic reaction;
1 The energy content of the products is
greater than that of the reactants.
2 The energy content of the reactants is
greater than that of the products
3 The energy of bond breaking is more than
that of bond formation.
4 The energy of bond breaking is less than
that of bond formation.
9.
4. Select an element which belongs to group I of
the Periodic Table.
A Calcium
B Sodium
C Magnesium
D Beryllium
10. Select the element(s) which react(s) with water
at room temperature to form an alkaline
solution.
Which of the following is a non–crystalline
form of sulphur?
A Plastic surphur
B Rhombic surphur
C Monoclinic surphur
D Alpha(a) surphur
5.
1 Sodium
2 Copper
3 Potassium
4 Magnesium
Identify the function of carbon monoxide in the
of iron from haematite?
A It acts as an oxidizing agent
B It acts as a drying agent
C It acts as a reducing agent
D It acts as a dehydrating agent
11.
Why is there no observable change when
potassium carbonate is heated?
A The reaction is too fast to observe any
change.
B Potassium carbonate decomposes on
heating
C Potassium carbonate is stable to heat
D The reaction is slow to observe any
change
6.
$
What is isotopy?
A The existence of atoms of the same element
with same mass number but different
atomic number
B The existence of atoms of the same element
with different masses
C The existence of atoms of an element same
neutron number but different proton
number
D The existence of an element in more than
one crystalline form in the physical state.
