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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.

4,306 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Question 1 of 20 4,306 total questions
Question 1041
jamb 2008

16.8 g of sodium hydrogen trioxocarbonate (IV) is completely decomposed by heat. Calculate the volume of carbon(IV) oxide given off at s.t.p
[Na 23, C = 12, O = 16, H = 1, Molar volume of a gas at s.t.p = 22.4 dm3]

A22.40 dm3
B11.20 dm3
C2.24 dm3
D1.12 dm3
View Explanation & Discuss
Question 1042
jamb 2008

2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
From the equation above, calculate the mass of sodium hydroxide produced by 2.3g of sodium.
[H = 1, O = 16, Na = 23]

A0.40g
B0.80g
C4.00g
D8.00g
View Explanation & Discuss
Question 1043
jamb 2008

In countries where the temperature falls below 273K, salt is always sprinkled on the icy road in order to

Alower the melting point of the ice
Bincrease the density of the ice
Cmake the ice impure
Draise the melting point of the ice
View Explanation & Discuss
Question 1044
jamb 2008

Chlorophyll obtained from green leaves of plant can be shown to be composed of more than one coloured component by the technique of

Acrystallization
Bhydrolysis
Cchromatography
Dsublimation
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Question 1045
waec 2007
Which of the these metals will not liberate hydrogen from dilute HCI?
ACopper
BIron
CMagnesium
DZinc
View Explanation & Discuss
Question 1046
waec 2007
What volume will 0.5 g of H2 occupy at s.t.p? [H = 1; 1 mole of a gas occupy 22.4 dm3 at s.t.p.]
A2.24 dm3
B5.60dm3
C11.20dm3
D44.80dm3
View Explanation & Discuss
Question 1047
waec 2007
Pig-iron is brittle because it contains
Aa high percentage of carbon as impurity
Bcalcium trioxosilicate (IV)
Cunreacted haematite
Dundecomposed limestone
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Question 1048
waec 2007
The following substances are heavy chemicals except
Asodium trioxocarbonate (IV)
Btetraoxosulphate (VI) acid
Clead (lV) tetraethyl
Dsodium hydroxide
View Explanation & Discuss
Question 1049
waec 2007
Which of the following methods can be used to separate a mixture of two miscible liquids with different boiling points?
ADecantation
BDistillation
CEvaporation
DFiltration
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Question 1050
waec 2007
from the following ores is iron extracted? I. Haematite ll. Bauxite III. Magnetite IV. Cassiterite
Al and ll only
Bl and lll only
Cl, ll and lll only
Dl, ll, lll and lV
View Explanation & Discuss
Question 1051
waec 2007
Glucose reduces Fehling's solution on warming to
Acopper (l) oxide
Bcopper (ll) oxide
Ccopper (l) chloride
Dcopper (ll) hydroxide
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Question 1052
waec 2007
Which of the following compounds reacts readily with sodium to liberate hydrogen?
ACH3CH2CH3
BCH3COOH
CCH3 CH2CHO
DCH3 CH(OH)CH3
View Explanation & Discuss
Question 1053
waec 2007

Consider the reaction below: Vegetable oil \(\frac{H2;NI catalyst}{High temperature}\) product. The reaction is applied in the manufacture of?

Adrugs
Bmargarine
Cparaffin wax
Dsoapy detergents
View Explanation & Discuss
Question 1054
waec 2007
Hydrocarbons which react with ammoniacal copper (l) chloride solution conform to the general molecular formula
ACnH2n
BCnH2n
CCnH2n+2
DCnH2n-2
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Question 1055
waec 2007
Alkenes undergo the following reactions except
Aaddition
Bhydration
Cpolymerization
Dsubstitution
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Question 1056
waec 2007
Which of the following pairs of substances can be distinguished by use of NaHCO3 solution?
ACH 3CH2OH and HCOOCH3
BCH 3CH2OH and CH3COOH
CCH3COOH and HCOOH
DCH 3CH2OH and CH3OH
View Explanation & Discuss
Question 1057
waec 2007
The complete hydrogenation of C 6
H 6 in the presence of nicked catalyst at 200oC gives
AC6H8
BC 6H10
CC 6H 12
DC 6H 14
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Question 1058
waec 2007
Which of the following substances is suitable solvent for perfumes?
ABenzene
BEthanol
CTurpentine
DWater
View Explanation & Discuss
Question 1059
waec 2007
What product is formed at the cathode during the electrolysis of concentrated sodium chloride solution using carbon electrodes?
AChlorine
BHydrogen
COxygen
DSodium
View Explanation & Discuss
Question 1060
waec 2007
What is the oxidation number of chromium in K2CrO4?
A+1
B+2
C+4
D+6
View Explanation & Discuss
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