Chemistry Past Questions

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4,306 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Past Questions

4,306 questions
Question 1 of 20 4,306 total questions
Question 291
jamb 2022

In the preparation of salts, the method employed will depend on the?

Acomposition
Bdissociating ability
Cstability to heat
Dprecipitating ability
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Question 292
jamb 2022

SO\(_2\) + O\(_2\) → 2SO\(_3\)

In the reaction above, the most suitable catalyst is?

Achromium(vi)oxide
Biron(iii)oxide
Ccopper(i)oxide
Dvanadium(v)oxide
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Question 293
jamb 2022

 

The IUPAC nomenclature of the structure is?

A3-chloro-3-methylbutane
B2,2,-dichloro-3-methylbutane
C3-methylchlorobutane
D2-chloro-2-methylbutane
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Question 294
jamb 2022

The sub-atomic particles located in the nucleus of an atom are?

Aneutron and proton
Bproton and electron
Cproton and ions
Dneutron and electron
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Question 295
jamb 2022
Isotopes of an element have the same
Aatomic mass
Bnumber of neutrons
Cmass number
Datomic number
Question 296
jamb 2022
Which of these is an element?
Awater
Bsalt
Coxygen
Dair
Question 297
jamb 2022
The molar mass of H¸?O (H=1, O=16) is
A2 g
B36 g
C18 g
D16 g
Question 298
jamb 2022
Which process separates a solid from a liquid using a filter paper?
Asublimation
Bcrystallisation
Cdistillation
Dfiltration
Question 299
jamb 2022
The formula of sulphuric acid is
ASO???
BH???SO???
CH???SO???
DH???S
Question 300
jamb 2022
The atomic number of an element is the number of
Aprotons
Bnucleons
Celectrons + neutrons
Dneutrons
Question 301
waec 2021

Which of the following scientists discovered the electrons?

AJoseph J. Thompson
BJames Chadwick
CAmedeo Avogadro
DErnest Rutherford
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Question 302
waec 2021

A coordinate covalent bond could be formed between?

ANH\(_{3}\) and PCl\(_{3}\)
BBCl\(_{3}\) and AlCl\(_{3}\)
CBCl\(_{3}\) and NH\(_{3}\)
DH\(^{+}\) and AlCl\(_{3}\)
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Question 303
waec 2021

Electrovalent compounds normally ------------

Ahave low boiling points
Bhave mobile electrons
Cconduct electricity in the solid state
Ddissolve in polar solvent
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Question 304
waec 2021

Which of the following statements about elements in Group VII is correct?

ABr\(_{2}\) will oxidize CI\(^{-}\)
BF\(_{2}\) has the least tendency to be reduced
CCl\(_{2}\) will oxidize I\(^{-}\)
Dl\(_{2}\) is a stronger oxidizing agent than F\(_{2}\)
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Question 305
waec 2021

Which of the following pairs of molecules form hydrogen bonds?

AC\(_{2}\)H\(_{5}\)OH and CH\(_{3}\)OH
BCH\(_{3}\)OH and H\(_{2}\)
CH\(_{2}\)S and CH\(_{4}\)
DNH\(_{3}\) and SO\(_{2}\)
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Question 306
waec 2021

The isotopes of neon are represented by the symbols \(^{20}\)\(_{x}\) Ne, \(^{21}\) \(_{y}\) Ne, and \(^{22}\) \(_{z}\) Ne. The relationship between x, y, and z is?

Ax > y > z
Bx < y < z
Cx = y= z
Dx < z < y
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Question 307
waec 2021

How many molecules of oxygen would occupy a volume of 2.24 cm\(^{3}\) at s.t.p?

[Molar volume at s.t.p = 22,400 cm\(^{3}\), Avogadro's number = 6.02 x 10\(^{23}\)]

A3.01 x 10\(^{20}\)
B3.01 x 10\(^{27}\)
C6.02 x 10\(^{19}\)
D6.02 x 10\(^{27}\)
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Question 308
waec 2021

The energy profile diagram illustrates-------------

Aan endothermic reaction
Ban exothermic reaction
Ca spontaneous reaction
Da redox reaction
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Question 309
waec 2021

The enthalpy change of the reaction is------------

AE\(_{A}\)
BE\(_{B}\)
CE\(_{C}\)
DE\(_{D}\)
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Question 310
waec 2021

The activation energy of the reaction is

AE\(_{A}\)
BE\(_{B}\)
CE\(_{C}\)
DE\(_{D}\)
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