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A student subtracted 0.00055 from 10.2345678 and reported the result as 10.23401. But his friend told him that the result was wrong. What is the correct result?

A. 10.234017
B. 10.2340178
C. 10.234
D. 10.23

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Correct Answer: D. 10.23
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The following statement contained in a student’s laboratory report is a conclusion.

A. a gas is liberated
B. colour of the gas is greenish yellow
C. oxide of the gas is strongly acidic
D. the gas is chlorine

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Correct Answer: D. the gas is chlorine
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A 50.00 mL sample of a cough mixture prepared by a pharmacist was found to have a mass of 46.0g. what is the density (in g/mL) of this mixture. Stated to the correct number of significant figures?

A. 0.92
B. 0.920
C. 0.9200
D. 1.087

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Correct Answer: B. 0.920
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Tobacco contains a poisonous alkaloid called Nicotine. The molecular formula of nicotine is C10H14N2 (molar mass = 162.23g). The mass percentage of nitrogen in nicotine, is?

A. 4.32%
B. 8.23%
C. 12.4%
D. 17.3%

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Correct Answer: D. 17.3%
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A sample of an ionic compound contains 2.82 g Na, 4.35 g CI, and 7.83 g O. The empirical formula of this compound is:

A. NaClO2
B. NaCIO3
C. NaCIO
D. NaCIO4

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Correct Answer: D. NaCIO4
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Professor Anwar told his students that air is a mixture because: suddenly a student raised his hand and said

A. it is colourless
B. oxygen can be removed from it
C. its composition is different at different altitudes
D. it has different properties from its constituents

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Correct Answer: C. its composition is different at different altitudes
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