Study and practice Chemistry past questions with answers and detailed explanations. Then test your knowledge using our interactive CBT practice platform and prepare confidently for your upcoming examinations.
How many lone pairs of electron are there on the central atom of the H2O molecules?
A1
B2
C3
D4
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Question 1752
jamb1992
The nucleus of the isotope tritium, contains?
Atwo neutrons with no protons
Bone neutron and one protons
Ctwo neutrons and one proton
Dtwo neutrons, one proton and one electron
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Question 1753
jamb1992
An increase in temperature causes an increase in pressure of a gas in a fixed volume due to an increase in the?
Anumber of molecules of the gas
Bdensity of the gas molecules
Cnumber of collisions between the gas molecules
Dnumber of collisions between the gas molecules and the walls of the container
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Question 1754
jamb1992
If 100 cm3 of oxygen pass through a porous plug in 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is?
(O = 16, H = 1)
A10.0 s
B12.5 s
C17.7 s
D32.0 s
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Question 1755
jamb1992
Which of the following is a measure of the average kinetic energy of the molecules of a substance?
AVolume
BMass
Cpressure from age grades
DTemperature
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Question 1756
jamb1992
A given mass of gas occupies 2 dm3 at 300k. At what temperature will its volume be doubled keeping the pressure constant?
A400 k
B480 k
C550 k
D600 k
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Question 1757
jamb1992
wH2SO4 + xAI(OH)3 → yH2O + = zAI2(SO4)3. The respective values of w.x.y and z in the equation above are?
A2,2,5 and 1
B3,2,5 and 2
C3,2,6 and 1
D2,2,6 and 2
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Question 1758
jamb1992
How many moles of (H+) are there in 1 dm3 of 0.5 M solution of H2SO4?
A2.0 moles
B1.0 moles
C0.5 mole
D0.25 mole
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Question 1759
jamb1992
There is a large temperature interval between the melting point and the boiling point of a metal because?
Ametals have very high melting points
Bmetals conduct heat very repaidly
Cmelting does not break the metalic bond but boiling does
Dthe crystal lattice of metals is easily broken
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Question 1760
waec1991
Which of the following is suitable for determining different isotopes present in an element which exhibits isotopy?
ASensitive weighing balance
BCathoda ray tube
CMass spectrometer
DGeiger muller counter
EEudiometer
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Question 1761
waec1991
Hydrogen is used for the following except
Amanufacturing of ammonia
Bsynthesis of hydrochloric acid
Cextinguishing fire
Dconversion of coal to petrol
Emanufacture of margarine
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Question 1762
waec1991
In solution, aminoethanoic acid (glycine) can be represented as NH+3 CH2COO. This implies that it
Ais soluble in all inorganic liquids
Bcan function as a weak acid or a weak base
Cdoes not form salt with mineral acids
Dis highly acidic
Ecannot form esters with alkanols
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Question 1763
waec1991
river contaminated by alkali waste will have a pH of about.
A1
B3
C5
D7
E9
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Question 1764
waec1991
An organic compound which reacts readily with bromine to form a compound with the formula CH3CHBrCH2Br is
Aethene
Bpropane
Cbutane
Dpropene
Epropyne
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Question 1765
waec1991
When a crystal was added to its solution, it did not dissolve and the solution remained unchanged, showing that the solution was
Aconcentrated
Bsupersaturated
Cunsaturated
Dcolloidal
Esaturated
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Question 1766
waec1991
A current of 4.0 amperes was passed through copper (ll) tetraoxosulphate (IV) solution for one hour using copper electrodes. What was the mass of copper deposited? (Cu = 64, 1F = 96500 C)
A3.2g
B4.8g
C6.4g
D48g
E96g
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Question 1767
waec1991
In which of the following crystals are the particles held by van der Waal's forces only?
ASodium chloride
BIce
CDiamond
DIodine
EQuartz
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Question 1768
waec1991
Compounds that have the same molecular formula but different structures are said to be
Aallotropic
Bpolymorphic
Cpolymeric
Disomeric
Eisotopic
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Question 1769
waec1991
Which of the following properties is not characteristic of electrovalent compounds?
Aformation of crystalline solids
Bsolubility in polar solvents
Chigh vapour pressures
Dhigh melting and boiling points
Eability to conduct electricity in aqueous solution
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Question 1770
waec1991
How many principal electronic shells has an atom whose electronic configuration is shown below? 1s22s22p63s1
