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Which of the following is a general method of preparing acids?
ADirect combination of constituent elements
BDouble decomposition involving a salt solution
CReaction between an anhydride and water
DReaction between a base and an amphoteric oxide
EDissolution of hydroxides followed by neutralization
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Question 1542
waec1997
An acid is a substance which in the presence of water produces
Asalts
Boxygen
Ceffervescence
Dhydroxonium ions
Ehydrogen gas
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Question 1543
waec1997
A given volume of methane diffuses in 20 seconds. How long will it take the same volume of sulphur (IV) oxide to diffuse under the same conditions? [CH\(_4\) = 16; SO\(_2\) = 64]
A5 seconds
B20 seconds
C40 seconds
D60 seconds
E80 seconds
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Question 1544
waec1997
An increase in the pressure of a gas results in a decrease in its
Amass
Bvapour density
Cvolume
Dtemperature
Econcentration
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Question 1545
waec1997
If the atomic number of an element X is 11 and that of nitrogen is 7, the most likely formula of the nitride of X is
AX3N
BXN3
CX3N2
DN2X
ENX2
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Question 1546
waec1997
A sodium atom and a sodium ion have the same
Anumber of neutrons
Bnumber of electrons
Celectric charge
Delectronic structure
Echemical properties
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Question 1547
waec1997
In linear molecules, the bond angle is
A90o
B140o
C109o
D120o
E180o
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Question 1548
waec1997
What is the most probable group of an element which is a soft, silvery white solid and reacts violently with water?
AGroup 0
BGroup 1
CGroup 4
DGroup 6
EGroup 7
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Question 1549
waec1997
Radon is used as a tracer in medical research because it
Ais monatomic
Bis radioactive
Cis a noble gas
Dhas a complete valence shell
Ehas a low boiling point
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Question 1550
waec1997
How many unpaired electrons are there in an atom of an element with the following electronic configuration? 1s22s22p6
Ao
B1
C2
D6
E8
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Question 1551
waec1997
The mass number of an element is the sum of its
Aelectrons, neutrons and protons
Belectrons and protons
Cprotons and neutrons
Dorbital electrons
Evalence electrons
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Question 1552
waec1997
The phenomenon observed when dust particles collide randomly in a beam of sunlight is known as?
ATyndal effect
Bdiffusion
Cosmosis
Dbrownian movement
Edialysis
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Question 1553
jamb1997
The compound above is the product of the oxidation of
A2-methlbutan-2-ol
B2-methylbutan -1- ol
C2, 3-dimethylprop 1-ol
DPentan -2- ol
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Question 1554
jamb1997
The compound above contains
ASp 3 hybridized carbon atoms only
BSp 2 hybridized carbon atoms only
CSp 3 and Sp hybirdized carbon atoms
DSp 3 and Sp 2
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Question 1555
jamb1997
Choose the correct answer from the options above. When Fehling is solution is added to two isomeric carbonyl compounds X and Y with the molecular formula C 5H 10O, compound X gives a red precipitate while Y does not react. It can be inferred that X is
AA
BB
CC
DD
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Question 1556
jamb1997
How many more isomers of the compound above can be obtained ?
A5
B4
C3
D2
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Question 1557
jamb1997
The IUPAC nomenclature of the organic compound with the above structural formula is
A3-ethyl-2,5-dimethylhexane
B4-ethyl-2,5-dimethylhexane
C3-ethyl-2,5,5 - trimethylpentane
D3-ethyl, 1,1,4-trimethylpentane
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Question 1558
jamb1997
In the diagram above the gas Y could be
Ahydrogen chloride
Boxygen
Ccarbon (IV) oxide
Dchlorine
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Question 1559
jamb1997
Use the graph above to answer this question. A sample, X, solid at room temperature, was melted, heated to a temperature of 358 K and allowed to cool as shown in OPQR.The section OP suggests that X is in the
Aliquid sate
Bsolid/liquid state
Csolid state
Dgaseous state
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Question 1560
jamb1997
Use the graph above to answer this question. A sample, X, solid at room temperature, was melted, heated to a temperature of 358 K and allowed to cool as shown in OPQR. The section PQ indicates that X is
