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 471:
A quantity of electricity liberates 3.6g of Silver from its salt. What mass of aluminium Will be liberated from its salt by the same quantity of electricity? [Al = 27, Ag = 108].
Options:
A) 2.7g
B) 1.2g
C) 0.9g
D) 0.3g
Show Answer
The correct answer is A .
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Question 472: Methane is member of the homologous series called?
Options:
A) alkenes
B) alcohols
C) esters
D) alkanes
E) alkynes
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The correct answer is D .
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Question 473:
Which of the following substances is a mixture?
Options:
A) Granulated sugar
B) Seawater
C) Sodium chloride
D) Iron filling
Show Answer
The correct answer is B .
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Question 474: When a bottle of Coca-Cola is opened, bubbles of evolve. The gas is?
Options:
A) hydrogen
B) carbon monoxide
C) carbon dioxide
D) sulphur oxide
E) chlorine
Show Answer
The correct answer is C .
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Question 475: The soft solder used for welding and plumbing is alloy of
Options:
A) lead and tin
B) iron and tin
C) lead and zinc
D) iron and zinc
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The correct answer is A .
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Question 476: The metal whose ore can be concentrated by passing it through a magnetic separator is
Options:
A) Zn
B) Sn
C) Cn
D) Ca
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The correct answer is B .
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Question 477: which of the following polymers is suitable for packaging and electrical insulation?
Options:
A) polyamide
B) polyethene
C) polycarbonate
D) polystyrene
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The correct answer is D .
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Question 478: Hardness of water is mainly due to the presence of
Options:
A) calcium hydroxide or magnesium hydroxide
B) calcium trioxocarbonate (IV) or calcium tetraoxosulphate (VI)
C) sodium hydroxide or magnesium ydroxide
D) calcium chloride or sodium chloride salts
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The correct answer is B .
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Question 479: Ammonium chloride can be separated from its mixture with common salt by
Options:
A) Distillation
B) Evaporation
C) Decantation
D) Sublimation
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The correct answer is D .
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Question 480:
50 cm3 of sulphur (lV) oxide, 800 cm3 of carbon (IV) oxide will respectively saturate 1.0cm3 of water at 15oC. Which of the following is suitable for demonstrating the fountain experiment?
Options:
A) Sulphur (IV) oxide and hydrogen chloride.
B) Carbon (IV) oxide and ammonia
C) Ammonia and hydrogen chloride
D) Carbon (IV) oxide and Sulphur (IV) oxide
Show Answer
The correct answer is C .