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On evaporation to dryness, 250 cm3 of saturated solution of salt X with relative molar mass 101 gave 50.5g of the. What is the soluility of the salt?
A1.0 mol dm-3
B2.0 mol dm-3
C4.0 moldm-3
D5.0 moldm-3
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Question 352
waec2011
Which of the following metallic oxides is amphoteric?
AAI2O3
BFe2O3
CMgO
DNa2O
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Question 353
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When NH 4CI was dissolved in water, the container was cold to touch. This implies that
Athe process is endothermic
Bthe process is exothermic
CNH4CI is highly soluble in water
DNH 4CI forms a saturated solution
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Question 354
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Which of the following statements about enthalpy of neutralization is correct? It
Ais constant for a strong acid and a strong base
Bcannot be determined using calorimeter
Chas a positive value
Dis higher for strong acid and a weak base
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Question 355
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The colour of phenolphthalein indicator in alkaline solution at the end-point of an acid-base titration is?
Acolourless
Borange
Cpink
Dyellow
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Question 356
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Which of the following equimolar solutions has the highest conductivity?
ACH3COOH(aq)
BH2CO3(aq)
CH 2SO 4(aq)
DNaOH (aq)
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Question 357
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The initial volume of a gas at 300 K was 220 cm 3 Determine its temperature if the volume became 250 cm 3
A183 K
B264 K
C300 K
D341 K
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Question 358
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The equation P = \(\frac{K}{V}\) illustrates
ABoyle's law
BCharles' law
CDalton's law
DGay Lussac's law
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Question 359
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Bubbling excess carbon (IV) oxide into calcium hydroxide solution results in the formaton of
ACaO
BCa(HCO3)2
CH2CO3
DCaCO3
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Question 360
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A gas that is collected by upward delivery is likely to be
Aheavier than air
Binsoluble in water
Clighter than air
Dsoluble in water
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Question 361
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Which of the following statements about a molar solution is correct? it
Ais a supersaturated solution
Bcannot dissolve more of the solute at that temperature
Ccontains any amount of solute in a given volume of solution
Dcontains one mole of the solute in 1 dm3 of solution
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Question 362
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The number of atoms in one mole of a substance is equal to the
Amass number
Boxidation number
Catomic number
Davogadro number
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Question 363
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What is the amount of magnesium that would contain 1.20 x 1024 particles? [Mg = 24, Avogadro's c x 1023]
A0.5 moles
B2.0 moles
C12.0 moles
D24.0 moles
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Question 364
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Consider the reaction represented by the following equation: xKMnO 4(aq) + ySO2(g) + zH2O(I) → K 2SO4(AQ) + 2MnSO4(aq) + 2H2SO x,y and z are respectively
A2,5 and 2
B2,2 and 5
C5, 1 and 2
D1, 5 and 2
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Question 365
waec2011
The volume occupied by 17g of H2S at s.t.p. is [H = 1.00, S = 32.0, Molar volume = 22.4 dm3]
A11.2dm 3
B17.0 dm3
C34.0dm 3
D44.8dm 3
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Question 366
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Which of the following statements about displacement reaction is correct?
AA more electropositive element displaces a less electroposive one
BA less electropositive element displaces a more electropositive one
CThe position of elements in the reactivity series has no effect on the reaction
Dit only occurs when the reaction is at equilibrium
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Question 367
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In metallic colids, the forces of attraction are between the mobile valence electrons and
Aatoms
Bneutrons
Cthe negative ions
Dpositively charged nuclei
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Question 368
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When element 20A combines with element 8Y,
Aa covalent compound, AY is formed
Ban ionic compound AY is formed
Can ionic compound, A2Y is formed
Da covalent compound, AY2 is formed
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Question 369
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The bond formed when two electrons that are shared between two atoms are donated by only one of the atoms is
Acovalent
Bdative
Cionic
Dmetalic
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Question 370
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Which of the following elements can conveniently be placed in two groups in the periodic table ?
