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A hydrocarbon compound contains 92.3% carbon Determine its empirical formula [H = 1.00; C = 12.0]
ACH
BCH2-
CCH3
DC3H2
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Question 302
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Which of the following reactions is common to all hydrocarbones?
ACombustion
BAddition
CPolymerization
DCondensation
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Question 303
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How many isomers has C\(_3\)H\(_6\)CI\(_2\)?
A2
B3
C4
D5
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Question 304
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Which of the following organic compounds would decolourize bromie water?
ABenzene
BCyclobutane
CHexane
DPentane
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Question 305
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The major product formed by the reaction between ethanoic acid and aqueous sodium hydroxide is
Asoap
Bsodium ethanoate
Csodium methoxide
Dwater
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Question 306
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The separation of petroleum fractions depends on the differences in their
Amelting points
Bmolar masses
Csolubilities
Dboiling points
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Question 307
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Consider the redox reaction as represented by the following equation: 12(aq) + 2S2O32-(aq) → 21-(aq) + S4O62-(aq). Which of the species in the equation is reduced?
AS4O62-(aq)
BS4O32-(aq)
C12(aq)
D1-(aq)
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Question 308
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Which of the following cells produce electrical energy from chemical reactions?
l. Lead-acid battery ll. Dry cell III. Deniell cell IV Electrolytic cell
Al and ll only
Bl, ll, and III only
Clll and IV only
DI and III only
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Question 309
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Consider the reaction represented by the equation: N\(_2\)O\(_4\)(g) ⇌ 2NO\(_2\)(g) ; ∆H = + x kJmol-1
What happens when the temperature is reduced at equilibrium?
AConcentration of N 2O4(g) decreases
BConcentration of N 2O4(g) increases.
CPressure exerted by the gases increases
DPressure exerted by the gases remains constant
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Question 310
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The following factors affect the solubility of a solid in a given solvent except
Anature of solute
Bnature of solvent
Cpressure
Dtemperature
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Question 311
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A substance is said to be impure if
Aits melting point range is wide
Bit dissolves in water with difficult
Cit has a low melting point
Dit is coloured
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Question 312
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Which of the following compounds crystallizes without water of crystallization?
AMgSO4
BNa2CO3
CNaCI
DFeSO4
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Question 313
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Which of the following acids would readily react with CaCO3 to liberate CO2?
ACH3COOH
BH2SO4
CH2SO3
DHNO3
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Question 314
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The aqueous solution which has pH > 7 is
AFeCI3(aq)
BCuSO4(aq)
CKNO3(aq)
DNa2CO3(aq)
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Question 315
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When heat is absorbed during a chemical reaction, the reaction is said to be
Aadiabatic
Bendothermic
Cexothermic
Disothermal
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Question 316
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Which of the following variables is a measure of the average kinetic energy of the molecule of a gas?
ADensity
BPressure
CTemperature
DVolume
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Question 317
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Which of the following gases are arranged in increasing order of diffusion rate? [H = 1 .0; C = 12; N = 14; O = 16; S = 32]
ASO 2 O2, NH3 H2
BH2S,NH2,O2,SO2
CCO2,N2O,O2,SO2
DNH3,NO2,N2,CO2
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Question 318
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The pressure exerted by a gas is a function of the
Atotal volume of the gas
Bspeed of the gaseous molecules
Cmass of each gaseous molecule
Dfrequency of collision between gaseous molecules
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Question 319
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Which of the following phenomenna lead to decrease in volume of a liquid in an open container?
ABrownian motion
BDiffusion
CEvaporation
DSublimation
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Question 320
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The gas law which describes the relationship between volume and temperature is
