Chemistry Exam Past Questions and Answers | JAMB, WAEC and NECO

Chemistry is the study of the substances that make up matter. It looks at their properties, how they react with each other, and how these reactions can create new substances.

Question 1321:
Which of the following factors will speed up the rate of evolution of carbon (iv) oxide in the reaction below?
2HCl + CaCO $_{3}$ → CaCl $_{2}$ + H $_{2}$ O + CO $_{2}$
Options:
A) Increasing the concentration of the acid
B) Increasing the surface area of CaCO $_{3}$
C) A and B
D) Reducing the concentration of the acid
Show Answer
The correct answer is C .
Question 1322: 3. 06 g of a sample of potassium trioxochlorate (V) (KCIO) was required to make a saturated solution with 10cm³ of water at 25^oC. The solubility of the salt at 25^oC is [K =39, Cl = 35.5, O = 16] Options:
A) 5.0 moles dm³
B) 3.0 moles dm³
C) 2.5 moles dm³
D) 1.0 molesv
E) 0.5 moles dm³
Show Answer
The correct answer is C .
Question 1323:
Stainless steel is an alloy made up of
Options:
A) Iron and zinc
B) Copper and tin
C) Iron and chromium
D) Iron and carbon
Show Answer
The correct answer is C .
Question 1324:
In the diagram above the gas Y could be
Options:
A) hydrogen chloride
B) oxygen
C) carbon (IV) oxide
D) chlorine
Show Answer
The correct answer is A .
Question 1325:
Which of the following statements is correct about the periodic table?
Options:
A) Elements in the same period have the same number of valence electrons
B) The valence electrons of the elements in the same period increase progressively across the period
C) Elements in the same group have the same number of electron shells
D) The non-metallic Properties of the elements tend to decrease across each period
Show Answer
The correct answer is B .
Question 1326: The fraction of crude oil used as jet fuel is Options:
A) refinery gas
B) diesel oil
C) kerosine
D) gasoline
Show Answer
The correct answer is C .
Question 1327:
With conc H₂SO₄ as catalyst
CH₃COOH + C₂H₅OH → CH₃COOC₂H₅ + H₂O
Options:
A) esterification
B) Condensation
C) saponification
D) neutralization
Show Answer
The correct answer is A .
Question 1328: Coal fire should not be used in poorly ventilated rooms because ? Options:
A) of the accumulation of CO₂ which causes dep sleep
B) it is usually too hot
C) of the acumulation of CO which causes suffocation
D) it removes most most of the gases in the rooms
Show Answer
The correct answer is C .
Question 1329:
GAS CO $_{2}$ N $_{2}$
O $_{2}$
% BY VOLUME 4 72 24
The above table shows the compositions of the atmosphere of planet X. Which of these gases are present inhigherpercentages on earth?
Options:
A) CO $_{2}$ and O $_{2}$
B) N $_{2}$ and CO $_{2}$
C) CO $_{2}$ , O $_{2}$ and N $_{2}$
D) O $_{2}$ and N $_{2}$
Show Answer
The correct answer is D .
Question 1330:
Use the options above to answer this question. Which is the structural formula for pent-2-enoic acid?
Options:
A) A
B) B
C) C
D) D
Show Answer
The correct answer is C .

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GAS	CO $_{2}$	N $_{2}$	O $_{2}$
% BY VOLUME	4	72	24