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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.

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

99 questions
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Question 1 of 19 99 total questions
Question 41
jamb 2017
The ideal gas laws and equations are true for all gases at
Alow pressures and lower temperatures
Blow temperatures and high pressures
Chigh pressures and high temperatures
Dlow pressure and high temperatures
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Question 42
jamb 2017
The salt formed from a weak acid and a strong base hydrolyzes in water to form
AA saturated solution
Ban acidic solution
Ca buffer solution
Dan alkaline solution
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Question 43
jamb 2017

Incomplete oxidation of ethanol yields

ACH3COOH
BCH3COCH3
CCH3CH2OCH2CH3
DCH3CHO
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Question 44
jamb 2017
A sample of orange juice is found to have a PH of 3.80. What is the concentration of the hydroxide ion in the juice?
A1.6 \(\times\) 10-4
B6.3 \(\times\) 10-11
C6.3 \(\times\) 10-4
D1.6 \(\times\) 10-11
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Question 45
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 46
jamb 2017
An isomer of C5H12 is
A2–ethyl butane
Bbutane
C2–methyl butane
D2–methyl propane
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Question 47
jamb 2017
The oxidation number of iodine in KIO3 is
A+7
B+3
C+5
D+6
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Question 48
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 49
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 50
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 51
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 52
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 53
jamb 2017
The acid anhydride that will produce weak acid in water is
ASO3
BNO2
CSO2
DCO2
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Question 54
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 55
jamb 2017
The tincture of iodine means iodine dissolved in
Aethanol
Bbromine chloride
Cchlorine water
Dwater
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Question 56
jamb 2017
Aluminium hydroxide is used in the dyeing industry as a
Adye
Bdispersant
Csalt
Dmordant
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Question 57
jamb 2017
The shape of the S-orbital is
Aelliptical
Bspiral
Ccircular
Dspherical
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Question 58
jamb 2017
The constituent common to duralumin and alnico is
ACo
BMn
CAl
DMg
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Question 59
jamb 2017

The general formula of alkanones is

ARCHO
BRCOR'
CRCOOH
DRCOOR
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