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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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4,306 questions

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Question 561

jamb 2017

When few drops of concentrated trioxonitrate(V) acid is added to an unknown sample and wanned an intense yellow colouration is observed. The likely functional group present in the sample is

ANH₂RCHCOOH

BCHO

CCO

DCNH₂

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Question 562

jamb 2017

An isomer of C₅H₁₂ is

A2–ethyl butane

Bbutane

C2–methyl butane

D2–methyl propane

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Question 563

jamb 2017

The oxidation number of iodine in KIO₃ is

A+7

B+3

C+5

D+6

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Question 564

jamb 2017

A given mass of gas occupies 2dm³ at 300k. At what temperature will its volume be doubled, keeping the pressure constant?

A400k

B480k

C550k

D600k

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Question 565

jamb 2017

For a general equation of the nature xP + yQ → mR + nS, the expression for the equilibrium constant is

Ak [P]^x [Q]^y

B\(\frac{[P]^x [Q]^y}{[R]^m [S]^n}\)

C\(\frac{[R]^m [S]^n}{[P]^x [Q]^y}\)

D\(\frac{m[R] n[S]}{x[P] y[Q] }\)

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Question 566

jamb 2017

The constituent of air necessary in the rusting process are

AO₂ and H₂O

BAr and CO₂

CCO₂ and H₂O

DO₂ and CO₂

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Question 567

jamb 2017

In the laboratory preparation of ethyl ethanoate, the water present in the mixture is removed using ?

AAnhydrous CaCl₂

Bconcentrated NaCO₄

Cdilute NaOH

Dconcentrated H₂SO₄

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Question 568

jamb 2017

The process that occurs when two equivalent forms of a compound are in equilibrium is

AIsotopy

BResonance

CIsomerism

DReforming

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Question 569

jamb 2017

The acid anhydride that will produce weak acid in water is

ASO₃

BNO₂

CSO₂

DCO₂

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Question 570

jamb 2017

Temporary hard water is formed when rain water containing dissolved carbon(IV) oxide flows over deposits of

ACaCO₃

BNa₂CO₃

CNa₂SO₄

DCaSO₄

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Question 571

jamb 2017

The tincture of iodine means iodine dissolved in

Aethanol

Bbromine chloride

Cchlorine water

Dwater

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Question 572

jamb 2017

Aluminium hydroxide is used in the dyeing industry as a

Adye

Bdispersant

Csalt

Dmordant

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Question 573

jamb 2017

The shape of the S-orbital is

Aelliptical

Bspiral

Ccircular

Dspherical

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Question 574

jamb 2017

The constituent common to duralumin and alnico is

ACo

BMn

CAl

DMg

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Question 575

jamb 2017

The general formula of alkanones is

ARCHO

BRCOR'

CRCOOH

DRCOOR

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Question 576

waec 2016

The alkanol obtained from the production of soap is

ADihydric Alkanol

BTertiary Alkanol

CTrihydric Alkanol

DMonohydric Alkanol

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Question 577

waec 2016

Which of the following metals is common to both brass and bronze?

AAluminium

BCopper

CLead

DIron

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Question 578

waec 2016

A consequences of global warming is

AAir pollution

BFlooding

CIncreased humidity

DWater pollution

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Question 579

waec 2016

Which of the following sources of energy contributes to green-house effect?

ANatural gas

BNuclear

CWind

DSolar

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Question 580

waec 2016

Consider the following reaction equation
C₂H_4(g) + 3O_2(g) \(\to\) 2CO_2(g) + 2H₂O_(l).

The volume of oxygen at s.t.p that will be required to burn 14g of ethene is
[C₂H₄ = 28; Molar volume of gas at s.t.p = 22.4dm³

A64.2dm³

B33.6dm³

C11.2dm³

D3.73dm³

View Explanation & Discuss

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