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Which of the following is a general method of preparing acids?
ADirect combination of constituent elements
BReaction between a base and an amphoteric oxide
CDouble decomposition involving a salt solution
DReaction between an anhydride and water
EDissolution of hydroxides followed by neutralization
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Question 652
waec1997
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 653
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 654
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 655
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 656
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 657
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 658
waec1997
In linear molecules, the bond angle is
A90o
B140o
C109o
D120o
E180o
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Question 659
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 660
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 661
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 662
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 663
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 664
waec1996
The following salts will produce a gas on reacting with hydrochloric acid except
ACuSO4
BCaCO3
CFeS
DNa2SO3
EK2CO3
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Question 665
waec1996
The following are properties of transition metals except
Avariable oxidation states
Btendency to form complext ions
Cformation of coloured ions
Dability to act as catalyst
Elow melting points
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Question 666
waec1996
The products formed when sodium hydrogen trioxocarbonate (IV) is heated strongly are
Acarbon (IV) oxide and sodium hydride
Bcarbon (IV) oxide and soudium trioxocarbonate (IV)
Csodium trioxocarbonate (IV) and steam
Dcarbon (IV) oxide and steam
Esodium trioxocarbonate (IV) carbon (IV) oxide and steam
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Question 667
waec1996
What amount of copper is deposited when 13.0g of zinc reacts with excess copper (ll) tetraoxosulphate (IV) solution according to the following equation? Zn (s) + CuSO4(aq) → ZnSO4(aq) + Cu (s) [Cu =63,5, Zn = 65]
A0.1 mole
B0.2mole
C0.3 mole
D0.4 mole
E0.5 mole
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Question 668
waec1996
Which of the following metals will be the most suitable for use where lightness and resistance to corrosion are of importance?
ALead
BCopper
CIron
DCalcium
EAluminium
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Question 669
waec1996
Ammonia gas is suitable for performing the 'Fountain' experiment because the gas is
