Chemistry Past Questions

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2,505 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Past Questions

2,505 questions
Question 1 of 20 2,505 total questions
Question 491
jamb 2010

Benzene reacts with hydrogen in the presence of nickel catalyst at 180ºC to give?

Axylene
Btoluene
Ccyclopentane
Dcyclohexane
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Question 492
jamb 2010

Which of the following organic compounds is very soluble in water?

ACH3COOH
BC2H2
CC2H4
DCH3COOC2H5
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Question 493
jamb 2010

Which of the following is used as fuel in miners' lamp?

AEthanal
BEthyne
CEthene
DEthane
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Question 494
jamb 2010

The IUPAC nomenclature of the compound above is?

A4 - ethyloctane
B5 - ethyloctane
C5 - propylheptane
D3 - propylheptane
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Question 495
jamb 2010

The residual solids from the fractional distillation of petroleum are used as?

Acoatings of pipes
Braw materials for the cracking process
Cfuel for the driving tractors
Dfuel for jet engines
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Question 496
jamb 2010

Stainless steel is used for making?

Amagnets
Btools
Ccoins and medals
Dmoving parts of clocks
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Question 497
jamb 2010

A compound gives an orange-red color to non-luminous flame. This compound is likely to contain?

ANa+
BCa2+
CFe3+
DFe2+
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Question 498
jamb 2010

When iron is exposed to moist air, it gradually rusts. This is due to the formation of?

Ahydrate iron (III) oxide
Banhydrous iron (III) oxide
Canhydrous iron (II) oxide
Dhydrate iron (II) oxide
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Question 499
jamb 2010

A constituent common to bronze and solder is?

Alead
Bsilver
Ccopper
Dtin
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Question 500
jamb 2010

Which of the following is used in rocket fuels?

AHNO3
BCH3COOH
CH2SO4
DHCl
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Question 501
jamb 2010

To a solution of an unknown compound, a little dilute tetraoxosulphate (VI) acid was added with some freshly prepared iron (II) tetraoxosulphate (VI) solution. The brown ring observed after the addition of a stream of concentrated tetraoxosulphate (VI) acid confirmed the presence of?

ACO\(^{2-}_{3}\)
BCl-
CSO\(_{3}^{2-}\)
DNO\(^{2-}_{3}\)
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Question 502
jamb 2010

2H2(g) + O2(g) ⇌ 2H2O(g) ΔH = -ve
what happens to the equilibrium constant of the reaction above if the temperature is increased?

Ait is unaffected
Bit becomes zero
Cit decrease
Dit increase
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Question 503
jamb 2010

The graph above demonstrate the effect of?

Asurface area on the rate of reaction
Bcatalyst on the rate of reaction
Cpressure on the rate reaction
Dconcentration on the rate of reaction
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Question 504
jamb 2010

In the preparation of oxygen by heating KClO\(_3\) in the presence of MnO\(_2\), only moderate heat is needed because the catalyst acts by?

Alowering the pressure of the reaction
Bincreasing the surface area of the reactant
Cincrease the rate of the reaction
Dlowering the energy barrier of the reaction
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Question 505
jamb 2010

If a reaction is exothermic and there is a great disorder, it means that?

Athe reaction is static
Bthe reaction is in a state of equilibrium
Cthere will be a large increase in free energy
Dthere will be a large decrease in free energy
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Question 506
jamb 2010

In which of the following is the entropy change positive?

AThermal dissociation of ammonium chloride
BReaction between an acid and a base
CAddition of concentrated acid to water
DDissolution of sodium metal in water
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Question 507
jamb 2010

What quantity of aluminum is deposited when a current of 10A is passed through a solution of an aluminum salt for 1930s?
[Al = 27, F = 96500 C mol -1]

A0.2 g
B1.8 g
C5.4 g
D14.2 g
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Question 508
jamb 2010

Iron can be protected from corrosion by coating the surface with?

Agold
Bsilver
Ccopper
Dzinc
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Question 509
jamb 2010

The IUPAC nomenclature of the compound LiAlH4 is?

Alithiumtetrahydridoaluminate (III)
Baluminium tetrahydrido lithium
Ctetrahydrido lithium aluminate (III)
Dlithium aluminium hydride
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Question 510
jamb 2010

6\(AgNO_{4(aq)} + PH_{3(g)} + 3H_2O_{(l)}\) → 6\(Ag_{(s)} + H_3PO_{3(g)} + 6HNO_{3(aq)}\)
In the above reaction, the reducing agent is?

AHNO3(aq)
BH2O(l)
CPH3(g)
DAgNO3(aq)
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