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Chemistry Past Questions and Answers

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Chemistry Questions

Question 446:

The boiling point of water, ethanol, toluene and butan-2-ol are 373.0k, 351.3k, 383.6k and 372.5k respectively. Which liquid has the highest vapour pressure at 323.0k?

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A Water
B Toluene
C Ethanol
D Butan-2-ol
E None

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Question 447:

In what respect will two dry samples of nitrogen gas differ from each other if sample 1 is prepared by completely removing CO<sub style='font-size: smaller;'>2</sub> and O<sub style='font-size: smaller;'>2</sub> from air, and sample 2 is prepared by passing purified nitrogen(i)oxide over heated copper? sample 1 is

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A Purer than sample 2
B Slightly denser than sample 2
C In all respects the same as sample 2
D Colourless but sample 2 has a light brown colour
E Slightly less reactive than sample 2

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Question 448:

Which of the following salts when dissolved in water will NOT give the corresponding pH value?

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A NaHSO<sub style='font-size: smaller;'>4</sub>, pH < 5
B Na<sub style='font-size: smaller;'>2</sub>CO<sub style='font-size: smaller;'>3</sub>, pH > 8
C Na<sub style='font-size: smaller;'>2</sub>Cl,pH = 7
D NaHCO, pH < 6

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Question 449:

Which of the following salts when dissolved in water will NOT give the corresponding pH value?

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A NaHSO<sub style='font-size: smaller;'>4</sub>, pH < 5
B Na<sub style='font-size: smaller;'>2</sub>CO<sub style='font-size: smaller;'>3</sub>, pH > 8
C Na<sub style='font-size: smaller;'>2</sub>Cl,pH = 7
D NaHCO, pH < 6

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Question 450:

Which of the following is an acidic salt?

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A NaHSO<sub style='font-size: smaller;'>4</sub>
B Na<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub>
C CH<sub style='font-size: smaller;'>3</sub>CO<sub style='font-size: smaller;'>2</sub>Na
D Na<sub style='font-size: smaller;'>2</sub>S

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