Chemistry Past Questions

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91 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Past Questions

91 questions
Question 1 of 20 91 total questions
Question 21
waec 2013

The element with electron configuration 1s\(^2\) 2s\(^2\) 2p\(^6\) 3s\(^2\) 3p\(^1\) belongs to

As-block period 3, group 1
Bp-block, period 3, group 2
Cs-block, period 3, group 3
Dp-block, period 3, group 3
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Question 22
waec 2013

Which of the following arrangements represents the correct order of electronic energy level?

A1s 2p 2s 3p 3s 3d 4s
B1s 2s 2p 3s 3p 3d 4s
C1s 2s 2p 3s 3p 4s 3d
D1s 2s 3s 2p 3p 4s 3d
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Question 23
waec 2013

Which of the following statements is correct?

AAtomic size decreases down the group
BAtomic size increases across the period
CAnions are smaller than the parent atom
DCations are smaller than the parent atom
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Question 24
waec 2013

An atom of an element X gains two electrons. The symbol of the ion formed is

AX +
BX 2+
CX 2-
DX -
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Question 25
waec 2013

The formula of the compound formed between a trivalent metal, M and a divalent non-metal, Y is

AM2Y3
BM3Y2
CMY
DM3Y
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Question 26
waec 2013

The molecule which has a linear shape is

ACH4
BNH3
CH2S
DCO2
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Question 27
waec 2013

Which of the following instruments is used in detecting the presence of radiation?

ACathode ray tube
BGeiger-Muller counter
CMass spectrometer
DX-ray tube
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Question 28
jamb 2013
2SO2(g) + O2(g) \( \iff \)2SO3(g)

\( \bigtriangleup H = -395.7kJmol^{-1} \)

In the reaction above, the concentration of 2SO3(g) can be in creased by
Adecreasing the pressure
Bdecreasing the temperature
Cthe addition of catalyst
Dincreasing the temperature
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Question 29
jamb 2013
Zn(s) + CuSO4(aq) \( \to \) ZnSO4(aq) + Cu(s)

In the reaction above, the oxidizing agent is
ACuSO4(aq)
BZnSO4(aq)
CCu(s)
DZn(s)
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Question 30
jamb 2013
The radioactive emission with the least ionization power is
A\( \alpha - particles \)
BX-rays
C\( \gamma -rays \)
D\( \beta - rays \)
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Question 31
jamb 2013
How many unpaired electron are in the p-orbitals of a fluorine atom?
A3
B\( 0 \)
C1
D2
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Question 32
jamb 2013
The compound above is an
Aalkanone
Balkanoate
Calkanal
Dakanol
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Question 33
jamb 2013

Use the following option above to answer this question. Which of the following compounds in solution will turn red litmus paper blue?

AA
BB
CC
DD
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Question 34
jamb 2013
Use the above option to answer this question. The dehydration of ammonium salt of alkanoic acids produces a compound with the general formula
AA
BB
CC
DD
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Question 35
jamb 2013

The IUPAC nomenclature for the compound above is

A4-methylpent-1-ene
B3-methylpent-2-ene
C2-methylpent-1ene
D2-methylpent-4-ene
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Question 36
jamb 2013
Choose the correct option from the graph above . 3Fe(S) + 4H2O(g) ⇌ Fe3O4(s) + 4H2(g). The equilibrium constant, K, of the reaction above is represented as
AA
BB
CC
DD
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Question 37
jamb 2013

In the graph above, the activation energy of the catalyzed reaction is

A100KJ
B300KJ
C250KJ
D200KJ
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Question 38
jamb 2013
From the diagram above, an ideal gas is represented by
AZ
BW
CX
DY
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Question 39
jamb 2013
An organic compound contains 60% carbon, 13.3% hydrogen and 26.7% oxygen. Calculate the empirical formula
rn(C=12,H =1, O=16)
AC 5H 12O
BC 3H 8O
CC 6H 13O 2
DC 4H 9O
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Question 40
jamb 2013
Which of the following fraction is used as raw material for the cracking process?
Akerosine
Blubricating oil
Cbitumen
Ddiesel oils
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