Chemistry Past Questions

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1,623 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Past Questions

1,623 questions
Question 1 of 20 1,623 total questions
Question 91
waec 2022

Which of the following acids would form normal salt only?

ATetraoxosulphate(VI) acid
BTrioxonitrate(V) acid
CTetraoxophosphate(V) acid
DTrioxosulphate(IV) acid
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Question 92
waec 2022

Consider the following reaction equation:
CaO + SiO\(_{2}\) ------> CaSiO\(_{3}\)
Silicon(IV) oxide is acting as

Aa basic oxide
Ba reducing agent
Can acidic oxide
Dan oxidizing agent
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Question 93
waec 2022

Before a reaction could take place, there should be

Aionization of reactant particles
Bbreakage of bonds of products
Cionization of product particles
D
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Question 94
waec 2022

A white precipitate was formed when BaCl\(_{2(aq)}\) was added to an aqueous solution
of a salt X. The precipitate dissolved in dilute HCl with rapid effervescence. Salt X is likely to contain

ASO\(_{4}\) \(^{2-}\) ions
BSO\(_{3}\) \(^{2-}\) ions
CNO\(_{3}\)- ions
DCO\(_{3}\) \(^{2-}\)- ions
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Question 95
waec 2022

Increasing the temperature generally

Adecreases the solubility of a solid in a liquid but increases the solubility of a gas in a liquid.
Bincreases the solubility of a solid in a liquid but decreases the solubility of a gas in a liquid.
Cincreases the solubility of both a solid and a gas in a liquid
Ddecreases the solubility of both a solid and a gas in a liquid
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Question 96
waec 2022

If 5.0 g of marble reacts with 25.0 cm3 hydrochloric acid, which of the following combinations has the fastest reaction rate?

AMarble chips and 2.0 mol dm\(^{-3}\) HCl\(_{(aq)}\)
BMarble chips and 2.5 mol dm\(^{-3}\) HCl\(_{(aq)}\)
CPowdered marble and 2.5 mol dm\(^{-3}\) HCl\(_{(aq)}\)
DPowdered marble and 2.0 mol dm\(^{-3}\) HCl\(_{(aq)}\)
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Question 97
waec 2022

A colourless gas with a pungent smell is evolved when dilute hydrochloric acid is added to a sample of a salt. The gas evolved could turn

Aacidified K\(_{2}\)Cr\(_{2}\)O\(_{7}\) solution colourless
Bacidified KMnO\(_{4}\) solution colourless
CFe(NO\(_{3}\))\(_{2}\) solution green
DPb(NO\(_{3}\))\(_{2}\) paper black
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Question 98
waec 2022

The IUPAC name for CH\(_{3}\)CHCH\(_{3}\)CHCLCHCH\(_{3}\)CH\(_{2}\)CH\(_{3}\) is

A2, 4 - dimethyl - 3 - chlorohexane
B3, 5 - dimethyl - 4 - chlorohexane
C4 - chloro - 3, 5 - dirnethylhexane
D3 - chloro - 2, 4 - dimethylhexane
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Question 99
waec 2022

Oxochlorate(I) acid is used as a bleaching agent because it is

Aa weak acid
Ba reducing agent.
Can oxidizing agent
Da strong acid.
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Question 100
waec 2022

Determine the quantity of electricity used when a current of 0.20 amperes is passed through an electrolytic cell for 60 minutes.

A12C
B120C
C360C
D720C
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Question 101
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 102
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 103
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 104
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 105
waec 2022

Which of the following compounds would react rapidly with bromine?

ABenzene
BHexane
CHexene
DHexanol
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Question 106
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 107
waec 2022

The following compounds are condensation polymers except

Anylon
Bprotein
Cstarch
Dpolyethene
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Question 108
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 109
waec 2022

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

Agalactose
Bmaltose
Cglucose
Dfructose
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Question 110
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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