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.

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

50 questions
Question 1 of 10 50 total questions
Question 21
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 22
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 23
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 24
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 25
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 26
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 27
jamb 2006

Carbon exist naturally in the combined state as?

Agraphite
Bcoal
Cdiamond
Dwood
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Question 28
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 29
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 30
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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