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Chemistry Past Questions

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4,306 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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Past Questions

4,306 questions

Question 1 of 20 4,306 total questions

Question 1601

waec 1995

Which of the following species is always present in acidified water?

ANH⁺₄

BO ^2-

CHCI

DH³O⁺

EHNO₃

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Question 1602

waec 1995

A weak acid is one which

Ais not corrosive

Bis slightly ionized in water

Cdoes not produce salts with alkalis

Ddoes not conduct an electric current in aqueous solution

Eforms acid salts with bases

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Question 1603

waec 1995

What is the percentage by mass of copper in copper in copper (l) oxide (CU₂O)? [O = 16; CU =64]

A88.9%

B80.0%

C66.7%

D20.0%

E11.1%

View Explanation & Discuss

Question 1604

waec 1995

Which of the following cannot be deduced from the electronic configuration of a transition metal?

APossession of magnetic property

BAbility to form complex ions

CPosition in the Periodic Table

DVariable oxidation states

EPhysical properties of the metal

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Question 1605

waec 1995

Which of the following molecules is linear in shape?

ACH₄

BH₂O

CNH₃

DH₂S

ECI₂

View Explanation & Discuss

Question 1606

waec 1995

If a solid has a low melting point and dissolves readily in benzene, it would probably

Acontain strong electrostatic forces of attraction

Bconduct electricity in the molten state

Cdissolve in water

Dhave covalent bonding

Eabsorb moisture on exposure to air

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Question 1607

jamb 1995

The functional group represented in the compound above is?

Aalkanol

Balkanal

Calkanone

Dalanoate

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Question 1608

jamb 1995

The option above shows the PH changes for the titration of a

Astrong acid versus strong base

Bweak acid versus strong base

Cstrong acid versus weak base

Dweak acid versus weak base

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Question 1609

jamb 1995

It can be deduced that the rate of the reaction?

Afor path l is higher than path ll

Bfor path ll is higher than path l

Cis the same for both paths at all temperatures

Ddepends on the values of both x and y at all pressures

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Question 1610

jamb 1995

Use the diagram above to answer this question. The activation energy of the uncatalysed reaction is

BX + Y

CX - Y

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Question 1611

jamb 1995

The arrangement above can be used for the collection of

Asulphur (IV) oxide

Bammonia

Chydrogen chloride

Dnitrogen

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Question 1612

jamb 1995

USE THE SECTION OF THE PERIODIC TABLE ABOVE TO ANSWER THIS QUESTION.Which letter represents a non-metal that is a solid at room temperature?

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Question 1613

jamb 1995

USE THE SECTION OF THE PERIODIC TABLE ABOVE TO ANSWER THIS QUESTION.Which of the indicate an alkali metal and a noble gas respectively?

AM and E

BG and E

CR and L

DG and L

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Question 1614

jamb 1995

The relatively high boiling points of alkanols are due to?

Aionic bonding

Baromatic character

Ccovalent bonding

Dhydrogen bonding

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Question 1615

jamb 1995

An example of a secondary amine is?

Apropylene

Bdi-butylamine

Cmethylamine

Dtrimethylamine

View Explanation & Discuss

Question 1616

jamb 1995

C_xH_Y + 4O₂ → 3CO₂ + 2H₂O. The hydrocarbon, C_xH_Y, in the reaction above is?

Apropane

Bpropene

Cpropyne

Dpropanone

View Explanation & Discuss

Question 1617

jamb 1995

The role of sodium chloride in the preparation of soap is to?

Apurify the soap

Bseparate the soap from glycerol

Caccelerate the decomposition of the fat or oil

Dreact with glycerol

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Question 1618

jamb 1995

Aromatic and aliphatic hydrocarbons can be distinguished from each other by the?

Aaction of bromine

Buse of polymerization reaction

Caction of heat

Duse of oxidation reaction

View Explanation & Discuss

Question 1619

jamb 1995

Which of the following pairs has compounds that are isomers?

APropanal and propanone

BEthanoic acid and ethylmethanoate

CEthanoic acid and ethane-1, 2-diol

D2-methylbutane and 2, 2-dimethylbutane

View Explanation & Discuss

Question 1620

jamb 1995

CHCl₃ + Cl₂ → HCl + CCl₄. The reaction above is an example of?

Aan addition reaction

Ba substitution reaction

Ca chlorination reaction

Da condensation reaction

View Explanation & Discuss

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