CHEM.化學 MC

Question 6
Excess of 0.1M hydrochloric acid is added to one of two identical samples of
sodium carbonate. An equal volume of 0.1M ethanoic acid is added to the other
sample. Provided all other conditions are kept the same, which of the following is
different for the two reactions?
A. the volume of hydrogen liberated
B. the mass of sodium carbonate dissolved
C. the colour of the remaining solution
D. the concentration of hydrogen ions in the remaining solution
Question 7
20 cm3 of 1.0M nitric acid is mixed with 30 cm3 of 0.5M sodium hydroxide solution.
Which of the following statements are correct?
(1) The pH value of the resulting solution is smaller than 7.
(2) If the resulting solution is evaporated to dryness, sodium nitrate crystallizes.
(3) The reaction is classified as a neutralization reaction because water and salt
are the only products.
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. All of them
Question 8
Sulphuric acid is added continuously to some potassium hydroxide in a conical flask.
Which of the following is taking place in the beaker?
A. The pH of the solution decreases.
B. The pH of the solution increases.
C. The concentration of the hydrogen ions decreases.
D. Potassium sulphate crystallizes in the beaker.
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Question 9
If 15 cm3 of 0.1M hydrochloric acid is required to neutralize a beaker of sodium
hydroxide solution, we can deduce from the above information
(1) the mass of sodium hydroxide in the solution.
(2) the concentration of sodium hydroxide.
(3) the number of moles of sodium hydroxide in the solution.
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. All of them
Question 10
A solution of sodium hydroxide contains 1.6 moles of the solute. How many moles of
sulphuric acid are required to neutralize the sodium hydroxide?
A. 0.8 mole
B. 1.6 mole
C. 3.2 mole
D. 4.8 mole