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.

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

77 questions
Question 1 of 17 77 total questions
Question 31
jamb 2006

CH3 - CH2 - C≡CH
The hybridization in the compound above is

ASp2
Bsp
Csp3 and sp2
Dsp3 and sp
View Explanation & Discuss
Question 32
jamb 2006

Which of the following has an isomer?

AC6H6
BC2H6
CC4H10
DC2H4
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Question 33
jamb 2006

An example of aliphatic unsaturated hydrocarbon is

Apentane
Bbutanol
Cpropene
Dbenzene
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Question 34
jamb 2006

Nigerian crude oil is described as light crude because of its

Alow sulphur content
Bhigh natural gas content
Chigh octane number
Dlow aliphatic-hydrocarbon content
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Question 35
jamb 2006

The gas obtained as a product of anaerobic action on organic matter buried in the earth is?

Aethene
Bmethane
Ccarbon (IV) oxide
Dnitrogen (IV) oxide
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Question 36
jamb 2006

Which of the following typically represents a photochemical reaction?

AFormation of water from hydrogen and oxygen molecules
BConversion of dinitrogen (IV) oxide to nitrogen (IV) oxide
CDecomposition of calcium hydroxide to its oxide
DConversion of silver halides to grey metallic silver
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Question 37
jamb 2006

The sulphide which is insoluble in dilute hydrochloric acid is

AFeS
BCuS
CZnS
DNa2S
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Question 38
jamb 2006

In the industrial production of H2 from natural gas the CO2 produced along with the H2 is removed by

Awashing under pressure
Bdrying over phosphorus (V) oxide
Cpassing the mixture into lime water
Dusing ammonical copper (I) chloride
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Question 39
jamb 2006

The characteristic colour of the flame shown when a copper salt moistened with concentrated hydrochloric acid on a platinum wire is put on bunsen burner is

Alilac
Bgreen
Cyellow
Dbrick-red
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Question 40
jamb 2006

Which of the following pairs of substance will react further with oxygen to form a higher oxide?

ACO2 and H2O
BNO and H2O
CCO and CO2
DSO2 and NO
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Question 41
jamb 2006

The ion that will give a white precipitate with aqueous NaOH and soluble in excess of the base is

ACa2+
BMg2+
CZn2+
DCu2+
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Question 42
jamb 2006

Dynamic equilibrium describes a situation where

Aa reaction gives back the reactant
Bthe concentration of the reactant and products is equal
Cboth forward and reverse reactions proceed at the same rate
Dreactants are converted to products
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Question 43
jamb 2006

The efficiency of a solid catalyst to increase reaction rates depends on its

Asurface area
Bsolubility
Cconcentration
Dquantity
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Question 44
jamb 2006

Carbon exist naturally in the combined state as?

Agraphite
Bcoal
Cdiamond
Dwood
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Question 45
jamb 2006

The group IA metals are not found free in nature because they

Aare very reactive and unstable
Bare malleable and ductile
Chave high melting and boiling point
Dconduct heat and electricity
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Question 46
jamb 2006

On heating, which of the following compounds will decompose to the free metal, nitrogen (IV) oxide and oxygen?

ACa(NO3)2
BCu(NO3)2
CAgNO3
DNaNO3
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Question 47
jamb 2006

The raw materials used for the smelting of iron ore in a furnace is

ACaSO4
BCaCO3
CCuSO4
DZn(NO3)2
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