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.
When excess ethanol is heated to 145oC in the presence of concentrated H2SO4, the product is
Aethyne
Bdiethyl sulphate
Cdiethyl ether
Dacetone
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Question 1472
jamb1999
Which of the following is a solvent for perfumes?
AC5H12
BC4H6
CCH3COOH
DC2H5OH
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Question 1473
jamb1999
2-methylprop-1-ene is an isomer of
Abut-2-ene
Bpent-1-ene
C2-methylbut-2-ene
D2-methylbut-1-ene
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Question 1474
jamb1999
The hydrocarbon that burns in air with a sooty flames is
AC2H6
BC3H8
CC4H10
DC6H6
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Question 1475
jamb1999
Which of the following metals is passive to concentrated trioxonitrate (V) acid?
AIron
BTin
CCopper
DZinc
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Question 1476
jamb1999
A metal that can be extracted from cassitertite is
Acacium
Bmagnesium
Ctin
Dcopper
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Question 1477
jamb1999
The pair of metals in the reactivity series that are usually extracted by the electrolysis of their ores is
Amagnesium and zinc
Bmagnesium and calcium
Ccopper and zinc
Dlead and calcium
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Question 1478
jamb1999
What properties of duralumin make it more useful than its constituent metals?
AIt is heavy with a high melting point
BIt is malleable and has high density
CIt is strong and light
DIt is hard and ductile
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Question 1479
jamb1999
Hydrogen is used in oxy-hydrogen flames for melting metals because it
Aevolves a lot of heat when burnt
Bcombines explosively with oxygen
Cis a very light gas
Dis a rocket fuel
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Question 1480
jamb1999
A pair of compounds that can be used to generate a gas which has physiological effect on human beings is
Asodium trioxonitrate (V) and calcium chloride
Bsodium dioxonitrate (III) and ammonium chloride
Csodium trioxonitrate (V) and ammonium chloride
Dsodium dioxonitrate (III) and potassium chloride
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Question 1481
jamb1999
The salt that reacts with dilute hydrochloric acid to produce a pungent smelling gas which decolourizes acidified purple potassium tetraoxomanganate (VII) solution is
ANa2SO4
BNa2SO3
CNa2S
DNa2CO3
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Question 1482
jamb1999
Chlorine, bromine and iodine resemble one another in that they?
Adissolve in alkalis
Breact violently with hydrogen without heating
Care liquids
Ddisplace one another from solutions of their salts
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Question 1483
jamb1999
The gas that will form a white precipitate with acidified silver trioxonitrate (v) is
ANH3
BSO2
CCO2
DHCL
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Question 1484
jamb1999
Which of the following statement is true of the electrochemical series?
AElectropositivity of metals increase down the series
BElectropositivity of non-metals decrease down the series
CElectronegativity of non-metals decrease down the series
DElectropositivity of metals decreases down the series
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Question 1485
jamb1999
RS(aq) + HF(aq) → RF(s) + HS(aq)
ΔH = -65.7 kj mol(-1).
From the equation above, it can be deduced that
Athe heat content of the reactants is lower than that of the products
Bthe heat content of the reactants is higher than that of the products
Cthe reaction is slow
Da large amount of heat is absorbed
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Question 1486
jamb1999
When a current I was passed through an electrolyte solution for 40 minutes, a mass X g of a univalent metal was deposited at the cathode. What mass of the metal will be deposited when a current 2I is passed through the solution for 10 minutes?
AX/4 g
BX/2 g
C2X g
D4X g
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Question 1487
jamb1999
X + Y → Z. The rate equation for the chemical reaction above is \(\frac{-Δx}{Δt}\) = K[X]\(^2\)[Y].
The overall order of the reaction is?
A0.0
B1.0
C2.0
D3.0
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Question 1488
jamb1999
What quantity of electricity will liberate 0.125 mole of oxygen molecules during the electrolysis of dilute sodium chloride solution?
[ F = 96 5000 C mol-1 ]
A24 125 coulombs
B48 250 coulombs
C72 375 coulombs
D96 500 coulombs
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Question 1489
jamb1999
N\(_2\)O\(_4\)(g) ↔ 2NO\(_2\)(g). Increase in total pressure of the equilibrium reaction above will
Aproduce more of NO2(g) in the mixture
Bconvert all of N2O4(g) to NO2(g)
Chave no effect on the concentrations of NO2(g)and N2O4(g)
Dproduce more of N2O4(g) in the mixture
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Question 1490
jamb1999
2SO2(g) + O2(g) ↔ 2SO3(g). In the chemical reaction above, the substance that will increase the rate of production of sulphur (VI) oxide is
