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
waec 2019

When an equilibrium is established between dissolved and undissolved solutes, the solution is said to be?

ASaturated
BUnsaturated
CConcentrated
DDiluted
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Question 22
waec 2019

Which of the following pairs of components have the same molecular mass?

[ H = 1.0, C = 12.0, O = 16.0 ]

AEthene and Ethyne
BEthane and Ethene
CCarbon (ii) Oxide and Ethene
DCarbon (iv) Oxide and Ethyne
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Question 23
waec 2019

Which of the substances is non-polar?

ABromine
BAmmonia
CWater
DHydrogen Bromide
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Question 24
waec 2019

Calcium and magnesium belong to the group of the periodic table because both?

Aare metals
Bform cations
Cform colourless salts
Dhave same number of valence electrons
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Question 25
waec 2019

If 6.5g of magnesium ribbon reacts completely with Hydrochloric acid, how many grams of hydrogen gas would be liberated?

Mg(s) + 2 HCl(aq) --> MgCl 2(aq) + H 2(g)

[ H = 1.0, Mg = 24.0 ]

A0.54g
B0.70g
C1.08g
D1.40g
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Question 26
waec 2019

The bleaching action of chlorine is through the process?

AHydration
BHydrolysis
CReduction
DOxidation
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Question 27
waec 2019

which of the following elements has the highest ionization energy?

ACalcium
BChlorine
CFlourine
DMagnesium
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Question 28
waec 2019

Which of the following metals reacts slowly with cold water?

AIron
BSilver
CCalcium
DPottassium
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Question 29
waec 2019

A solid with higher melting and boiling points is likely to be?

ACovalent compound
BA Dative compound
CAn Electrovalent compound
DA Non-metal
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Question 30
waec 2019

The periodic table is an arrangement of elements according to their? 

AOxidation number
BAtomic number
CMass number
DNumber of neutrons
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