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Hardness of water is mainly due to the presence of
Acalcium hydroxide or magnesium hydroxide
Bcalcium trioxocarbonate (IV) or calcium tetraoxosulphate (VI)
Csodium hydroxide or magnesium hydroxide
Dcalcium chloride or sodium chloride salts
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Question 852
jamb2011
What type of bond exits between an element X with atomic number 12 and Y with atomic number 17?
AElectrovalent
BMetallic
CCovalent
DDative
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Question 853
jamb2011
The importance of sodium aluminate (III) in the treatment of water is to
Acause coagulation
Bneutralize acidity
Cprevent goitre and tooth decay
Dkill germs
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Question 854
jamb2011
From the diagram above, find the amount of solute deposited when 200 cm\(^3\) of the solution is cooled from 55°C to 40°C.
A0.10 mole
B0.20mole
C0.01 mole
D0.02 mole
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Question 855
jamb2011
The arrangement of particles in crystal lattices can be studied using
AX - rays
Bγ - rays
Cα - rays
Dβ - rays
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Question 856
jamb2011
The molecular lattice of iodine is held together by
Adative bond
Bmetallic bond
Chydrogen bond
Dvan der Waal's forces
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Question 857
jamb2011
An isotope has an atomic number of 15 and a mass number of 31. The number of protons it contain is
A16
B15
C46
D31
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Question 858
jamb2011
The relative atomic mass of a naturally occurring lithium consisting of 90% \(^7 _3\)Li and \(^6 _3\)10% Li is
A6.9
B7.1
C6.2
D6.8
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Question 859
jamb2011
Which of the following questions is correct about the periodic table?
AThe non-metallic properties of the elements tend to decrease across each period
BThe valence electrons of the elements increase progressively across the period
CElements in the same group have the same numbeer of electron shells
DElements in the same period have the number of valence electrons
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Question 860
jamb2011
From the diagram above, an ideal can be represented by
AM
BN
CK
DL
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Question 861
jamb2011
Which of the following properties is NOT peculiar to matter?
Akinetic energy of particles increase from solid to gas
BRandom motion of particles increases from liquid to gas
COrderliness of particles increases from gas to liquid
DRandom motion of particles increases from gas to solid
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Question 862
jamb2011
What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution?
[Na = 23, O = 16, H = 1]
A0.40 mol dm-3
B0.50 mol dm-3
C0.05 mol dm-3
D0.30 mol dm-3
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Question 863
waec2010
Which of the following metals exists as liquid at ordinary temperature?
ACopper
BGold
CMercury
DSilver
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Question 864
waec2010
Which of the following substances cannot be classified as a heavy chemical?
AAgNO3
BCaO
CCaOCI2
DH2SO4
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Question 865
waec2010
The main function of limestone in the blast furnance is to
Aact as a reducing agent
Bact as a catalyst
Cremove impurities
Dsupply carbon (IV) oxide
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Question 866
waec2010
Compound N reacts with sodium metal to produce a gas that gives a 'pop' sound with a burning splint N also react with ethanoic acid to give a sweet smelling liquid. Compound N is an
Aalkanol
Balkanoate
Calkane
Dalkanoic acid
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Question 867
waec2010
An organic compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen. What is the empirical formula of the compound? [O = 16.0, C = 12.0, H = 1.0]
AC2HO
BCHO
CCH2O
DCHO2
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Question 868
waec2010
The IUPAC name of C2H6COOC2,/sub>H6 is
Aethyethanoate
Bethylproanoate
Cpropylethanoate
Dpropylpropanoate
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Question 869
waec2010
The products of fermentation of sugar are
Acarbon(IV) oxide and water
Bethanol and carbon (IV) oxide
Cethanol and water
Dethanol and enzymes
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Question 870
waec2010
An advantage of detergent over soap is that detergents
