Chemistry is the study of the substances that make up matter. It looks at their properties, how they react with each other, and how these reactions can create new substances.
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Question 451: 60cm3 of hydrogen are sparked with 20cm3 of oxygen at 100°C and 1 atmosphere. The total volume of the residual gases is?
Options:
A) 60 cm3
B) 10 cm3
C) 40 cm3
D) 30 cm3
E) 70 cm3
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The correct answer is A .
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Question 452: The solution that will conduct the highest amount of electricity is
Options:
A) 0.5 mol dm-3 of hydrochloric acid
B) 2.0 mol dm-3 of hydrochloric acid
C) 0.5 mol dm-3 ethanoic acid
D) 2.0 mol dm-3 ethanoic acid
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The correct answer is A .
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Question 453: An example of an alcohol is
Options:
A) CCl4
B) CH3COOH
C) CHCl3
D) C2H6
E) CH3OH
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The correct answer is E .
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Question 454: COg + H2Og 2g + H2g H = -4100J. Which of the following factors favour the formation of hydrogen in the above reaction? i. high pressure. ii. low pressure iii. high temperature iv. use of excess steam
Options:
A) i, iii and iv
B) iii only
C) ii, iii and i
D) iv only
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The correct answer is D .
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Question 455: The balanced equation for the reaction of tetraoxosulphate(VI)acid with aluminium hydroxide to give water and aluminium tetraoxosulphate(VI) is
Options:
A) H2SO4 + Al(OH)2 2H2O + AlSO4
B) 3H2SO4 + 2Al(OH)3 6H2O + Al2(SO4)3
C) 3H2SO4 + 2AlH 6H2O + Al(SO4)3
D) 3H2 SO4 + 2Al(OH)3 Al(SO4)3
E) H2SO4 + Al(OH)3 H2O + Al2(SO4)3
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The correct answer is B .
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Question 456: When few drops of concentrated trioxonitrate(V) acid is added to an unknown sample and wanned an intense yellow colouration is observed. The likely functional group present in the sample is
Options:
A) NH3—C—C=O
B) CHO
C) CO
D) CNH2
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The correct answer is A .
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Question 457: On which of the following is the solubility of a gaseous substance dependent? I. Nature of solvent II. Nature of solute III. Temperature IV. Pressure
Options:
A) I, II, III and IV
B) I and II only
C) II only
D) I, III and IV only
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The correct answer is D .
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Question 458: The gas that is removed by the water in the flask is
Options:
A) O 2
B) SO 2
C) HCI
D) H 2
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The correct answer is C .
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Question 459: Vulcanization of rubber is a process by which
Options:
A) isoprene units are joined to produce rubber
B) rubber latex is coagulated
C) sulphur is chemically combined in the rubber
D) water is removed from the rubber
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The correct answer is C .
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Question 460:
If the heat of combustion of hydrogen is -285.8kJ,
What is the heat of formation of water?
Options:
A) +571.6 kJ
B) -571.6 kJ
C) -285.8 kJ
D) +285.8 kJ
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The correct answer is C .