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Chemistry · Question 121
Which of these alcohols gives a positive iodoform test?
Butan-1-ol
Methanol
Ethanol
Propan-1-ol
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Correct answer: C
Ethanol
Ethanol is oxidised to ethanal during the reaction and gives the yellow iodoform precipitate.
Chemistry · Question 122
Which carbon allotrope conducts electricity through mobile delocalised electrons within its layers?
Diamond
Graphite
Both diamond and graphite equally
Neither diamond nor graphite
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Correct answer: B
Graphite
Graphite contains delocalised electrons that can move along its layers.
Chemistry · Question 123
Which monomer is used to produce polyethene by addition polymerisation?
Ethanol
Ethanoic acid
Ethane
Ethene
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Correct answer: D
Ethene
Ethene molecules join by opening their carbon-carbon double bonds to form polyethene.
English · Question 124
Choose the correct article: "She gave ___ honest account of the incident."
an
the a
a an
a
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Correct answer: A
an
Use an before the vowel sound at the start of honest; its h is silent.
English · Question 125
Choose the correct article: "He hopes to study at ___ university next year."
a an
an the
an
a
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Correct answer: D
a
University begins with a consonant /y/ sound, so the indefinite article is a.
English · Question 126
Complete: "I borrowed a dictionary yesterday. ___ dictionary has a blue cover."
An the
An
A an
The
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Correct answer: D
The
Use the when referring again to the specific dictionary already introduced.
English · Question 127
Choose the past-simple passive of: "The examiner checked the forms."
The forms were checked by the examiner.
The forms are checking the examiner.
The forms was checked by the examiner.
The forms have checking by the examiner.
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Correct answer: A
The forms were checked by the examiner.
The past-simple passive uses was or were plus the past participle. The plural subject forms takes were.
English · Question 128
Complete the future passive: "The result ___ tomorrow."
will be announced
will been announced
will announcing
will announce
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Correct answer: A
will be announced
The future passive uses will be followed by a past participle.
English · Question 129
Choose the present-perfect passive: "The staff have cleaned the room."
The room has cleaning by the staff.
The room is been clean by the staff.
The room has been cleaned by the staff.
The room have been cleaned by the staff.
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Correct answer: C
The room has been cleaned by the staff.
The singular subject room takes has; the present-perfect passive is has been cleaned.
English · Question 130
Choose the standard first-conditional form: "If you revise tonight, you ___ better prepared tomorrow."
were being
would have been
will be
had been
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Correct answer: C
will be
For a possible future result, use if plus present simple and will plus the base verb.