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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.

135 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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135 questions

Question 1 of 20 135 total questions

Question 11

neco 2008

Matter is neither created nor destroyed in the course of any chemical reactions is a statement of the law of

Acombining volumes

Bconservation of mass

Cdefinite proportion

Dmultiple proportion

Ereciprocal proportion.

View Explanation & Discuss

Question 12

neco 2008

pH is define as

A[H+]

B–log [H]

C–log [H+]

Dlog [H]

Elog [H+]

View Explanation & Discuss

Question 13

neco 2008

Which of the following compounds is unsaturated?

ACyclohexane

BMethoxyethane

C1 ,2-dibromoethane

D2,2,3-trimethylpentane

E3-methylbut-l-ene

View Explanation & Discuss

Question 14

neco 2008

A solution is prepared by dissolving I .96g of H₂SO₄ in 250 cm³ of its solution. What is the concentration in moles per dm³?

A0.008

B0.08

C0.1

D0.8

E8.02

View Explanation & Discuss

Question 15

neco 2008

The action of zinc on an acid produces

Achlorine

Bhydrogen

Cnitrogen

Dsulphur

Ewater vapour.

View Explanation & Discuss

Question 16

neco 2008

The high boiling point of hydrogen fluoride can be explained in terms of?

Acovalent bonds.

Bdative bonds.

Cdipole-dipole bonds

Delectrovalent (ionic) bonds.

Ehydrogen bonds.

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Question 17

neco 2008

What type of bond holds hydrogen fluoride molecules together when forming larger aggregate?

ACovalent

BDative

CHydrogen

DIonic

EMetallic

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Question 18

neco 2008

A device used in the laboratory for intermittent production of gases without heating is

Aaspirator

Bdelivery tube

Cfume cupboard

Dkipp’s apparatus

Emuller counter

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Question 19

neco 2008

If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged is that with the

Agreater stability in solution

Blower electrical charge

Csmaller mass

Dstronger tendency to accept electrons

Estronger tendency to lose electrons.

View Explanation & Discuss

Question 20

neco 2008

The planet with the highest number of moon is

AEarth

BJupiter

CUranus

DPluto

EVenus.

View Explanation & Discuss

Question 21

neco 2008

Pipe-borne water is usually chlorinated in order to

Acoagulate sediments in the water

Bimprove taste of the water

Ckill harmful bacteria in the water

Dmake it pure

Eremove the hardness in the water

View Explanation & Discuss

Question 22

neco 2008

The rate of a chemical reaction is NOT affected by one of these factors

Acolour

Bconcentration

Cpresence of light

Dsurface area

Etemperature

View Explanation & Discuss

Question 23

neco 2008

The molecular formula of ethylbutanoate is?

ACH₅COOC₂6

BC₃HCOOC₂H₇

CC₃H₇COOC₃H₇

DC₃H₇COOC₄H₉

EC₃H₇COOC₂H₅

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Question 24

neco 2008

Which of the following is a component of the car exhaust?

AAluminium

BCalcium

CIron

DZinc

ELead

View Explanation & Discuss

Question 25

neco 2008

Which of the following will Increase the rate of reaction of Chips of a metal M as shown in the equation below?

M(s)+2HC1(aq) → MCI₂ (aq) + H₂(g)

AAdding some distilled water

BDecreasing the temperature

CDiluting the hydrochloric acid

DGrinding the metal into powder

EIncreasing the pressure

View Explanation & Discuss

Question 26

neco 2008

What is the colour of phenolphthalein indicator in a basic medium?

ABlue

BColourless

COrange

DPink

EYellow

View Explanation & Discuss

Question 27

neco 2008

\( ^{234}_{90}Th → ^{234}_{91}Pa + X \)
In the nuclear reaction above, X is

A\( ^0_1e \)

B\( ^0_{-1}e \)

C\( ^4_2He \)

D\( ^1_0n \)

E\( ^1_1p\)

View Explanation & Discuss

Question 28

neco 2008

When dust particles collide randomly in a beam of Sunlight, the phenomenon observed is known as

ABrownian movement.

BDialysis

CDiffusion

DOsmosis

ETyndall effect

View Explanation & Discuss

Question 29

neco 2008

The most efficient absorber of ultraviolet radiation in the atmosphere is

ACO₂

BH₂

CH₂O

D0₂

EO₃

View Explanation & Discuss

Question 30

neco 2008

Chlorine atom forms Cl- by

Adonating lone pair of electrons

Bgaining an electron

Closing an electron

Dsharing an electron

Esharing a lone pair of electrons.

View Explanation & Discuss

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