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 541:
2H2 + O22 → H2+O ΔH = -571kJ
In the equation above, how much heat will be liberated if 12.0g of hydrogen is burnt in excess oxygen?
Options:
A) -1142 kJ
B) -571 kJ
C) +1142 kJ
D) -1713 kJ
Show Answer
The correct answer is D .
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Question 542: A gas that turns a filter paper previously soaked in lead ethanoate solution black is?
Options:
A) hyrogen chloride
B) hydrogen sulphide
C) sulphur (IV) oxide
D) sulphur (VI) oxide
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The correct answer is B .
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Question 543:
Which of the gas laws does this graph illustrate?
Options:
A) Boyle
B) Charles
C) Gay-Lussac
D) Graham
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The correct answer is B .
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Question 544: The number of isomers formed by C6H14 is
Options:
A) 4
B) 5
C) 2
D) 3
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The correct answer is B .
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Question 545: Which of the following organic compounds is very soluble in water?
Options:
A) CH3COOH
B) C2H2
C) C2H4
D) CH3COOC2H5
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The correct answer is A .
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Question 546: The allotropy of carbon used in the decolourization of sugar is
Options:
A) Graphite
B) Soot
C) Charcoal
D) Lampblack
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The correct answer is C .
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Question 547: Which of the following compounds is a base?
Options:
A) CO2
B) CaO
C) H3PO3
D) CH3COOCH3
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The correct answer is B .
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Question 548:
The solubility curve of a solid X (molecular mass = 160) is as show above 1,000 cm3 of a saturated solution of X at 80oC. The weight of X crystalized out would be
Options:
A) 10 g
B) 12 g
C) 14 g
D) 16 g
E) 18 g
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The correct answer is D .
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Question 549: 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 550: Beryllium and aluminium have similar properties because they
Options:
A) are both metals
B) belong to the same group
C) belong to the same period
D) are positioned diagonally to each other
Show Answer
The correct answer is D .