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.

50 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Past Questions

50 questions
Question 1 of 10 50 total questions
Question 21
waec 2022

The products of the electrolysis of dilute sodium chloride using carbon electrodes are

Anode Cathode

Achlorine and sodium.
Boxygen and hydrogen.
Cchlorine and hydrogen.
Dhydrogen and oxygen.
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Question 22
waec 2022

If 60 g of M combines with 24 g of oxygen, what would the empirical formula of the oxide be?

( molar mass of M = 120, O = 16)

AMO
BMO\(_{2}\)
CMO\(_{3}\)
DMO\(_{4}\)
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Question 23
waec 2022

Which of the following statements about the standard hydrogen electrode is not correct?

AThe hydrogen gas is at a pressure of 1 atmosphere
BA solution containing 1 mol dm-3 of H+ (aq) ions is used
CA platinum electrode is used
DThe temperature is kept at 20 °C
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Question 24
waec 2022

Alkanols can be manufactured from alkenes by the initial reaction of alkenes with

Abromine in tetrachloromethane
Bconcentrated tetraoxosulphate(VI) acid
Caqueous potassium tetraoxomanganate(VII).
Dsodium hydroxide solution.
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Question 25
waec 2022

Which of the following compounds would react rapidly with bromine?

ABenzene
BHexane
CHexene
DHexanol
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Question 26
waec 2022

What amount of electricity is required to deposit one mole of aluminium from a solution of AlCl3?

AOne Faraday
BOne ampere
CThree Faradays
DThree amperes
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Question 27
waec 2022

The following compounds are condensation polymers except

Anylon
Bprotein
Cstarch
Dpolyethene
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Question 28
waec 2022

The cleansing effect of soap is low in acidic water because of

Athe formation of unionized fatty acid.
Bincrease in the pH of the soap molecules.
Canti-biodegradable effect of hydrogen ions
Dthe hardness of the acidic water.
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Question 29
waec 2022

Which of the following sugars is a product of the condensation of monosaccharides?

Agalactose
Bmaltose
Cglucose
Dfructose
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Question 30
waec 2022

The by-product of fermentation of sugar is

Acarbon(IV) oxide.
Bethanoic acid.
Cpropanol
Dpropan-1, 2, 3- triol.
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