ACIDS AND BASES QUIZ

1. ACIDS AND BASES QUIZ Click to start

2. A It is concentrated. B It does dissociate in water. C It almost completely dissociate in water. It absorbs water from the air. D Question 1 Which one of the followig descriptions defines a strong acid?

3. Wrong Answer! A strong acid is almost completely dissociated. HA(aq)  H+(aq) + A-(aq) Try Again

4. A Zn + H2SO4 ZnSO4 + H2 B 4Zn + H2SO4 4ZnO + H2S C Zn + 2H2SO4 2ZnS + 2H2O + 3O2 Zn + H2SO4 ZnH2 + SO2 + O2 D Question 2 Which of the following represents the reaction between zinc powder and a dilute aqueuous solution of sulfuric acid?

5. Wrong Answer! Metals react with acids to form hydrogen and salt. Try Again

6. A B HNO3<H2CO3<Ba(OH)2<NH3 NH3<Ba(OH)2<H2CO3HNO3 C Ba(OH)2<H2CO3<NH3<HNO3 D HNO3<H2CO3<NH3<Ba(OH)2 Question 3 When the following 1.0 moldm-3 solutions are listed in increasing order of pH (lowest first), what is the correct order ?

7. Wrong Answer! strong acid < weak acid < weak base < strong base Try Again

8. A B +NH3CH(CH3)COO - C +NH3CH(CH3)COOH +NH3CH(CH3)COOH 2+ D Question 4 The amino acid alanine has the structure: H2N-CH(CH3)-COOH Which of the following species represents its conjugate acid ? NH2CH(CH3)COO -

9. Wrong Answer! The conjugate acid is formed by protonation of the amino group Try Again

10. A H2O/H3O+ B CH2ClCOO -/H3O+ C H2O/CH2ClCOO - CH2ClCOOH/H2O D Question 5 In the equilibrium below, which species represents a conjugate acid-base pair? CH2ClCOOH(aq) + H2O(l) CH2ClCOO-(aq) + H3O+(aq)

11. Wrong Answer! A conjugate acid-base pair differ by a proton (H+) Try Again

12. A Hydrogen chloride does not form ions in water. B Ethanol accepts hydrogen ions (protons) and water does not. C Magnesium is very soluble in ethanol but insoluble in water. Water is a hydrogen ion/proton acceptor D Question 6 Hydrogen chloride dissolved in water reacts with magnesium. Hydrogen chloride dissolved in ethanol does not react with magnesium. Which statement accounts for this observation?

13. Wrong Answer! Acid behaviour is observed in water since the water molecule is a strong base (proton acceptor) and forms hydronium ions, H3O+. Try Again

14. A Benzenecarboxylic acid solution has a high concentration of ions. B Benzenecarboxylic acid is only slightly dissociated in water. C Benzenecarboxylic acid is completely dissociated in water. It is a strong acid. D Question 7 A dilute aqueous solution of benzenecarboxylic acid (an organic acid) is a poor conductor of electricity. Which of the following statements accounts for this observation?

15. Wrong Answer! The low concentration of ions accounts for its low conductivity. Try Again

16. A decrease in the H+ concentration and an increase in the OH- concentration. An increase in the OH- concentration and an increase in the H+ concentration. A B A decrease in the H+ concentration with no change in the OH- concentration. An increase in the H+ concentration and a decrease in the OH- concentration. C D Question 8 A decrease in the pH of an aqueous solution corresponds to:

17. Wrong Answer! A decrease in pH correlates to an increase in the hydrogen ion concentration. Try Again

18. A An increase by a factor of 2. B An increase by a factor of 100. C A decrease by a factor of 2. A decrease by a factor of 100. D Question 9 Calcium oxide is added to a lake to neutralise the effects of acid rain. The pH value of the lake water rises from 4 to 6. What is the change in concentration of [H+(aq)] in the lake water?

19. Wrong Answer! pH and [H+] are inversely related. An increase in the pH by a value of 1 corresponds to x10 decrease in the H+ Try Again

20. A CO32- B HSO4- C NO3- Such a species does not exist. D Question 10 Which of the ions behave as a BrØnsted – Lowry base and as a BrØnsted – Lowry acid?

21. Wrong Answer! HSO4- SO4- + H+ HSO4- + H+  H2SO4 Try Again

22. A [H+] in X is half that in Y. B [H+] in X is twice that in Y. C [H+] in X is ten times that in Y. [H+] in X is a hundred times that in Y. D Question 11 The pH of solution X is 1 and that of Y is 2. Which statement is correct about the hydrogen ion concentrations in the two solutions?

23. Wrong Answer! A change in pH of 1 unit corresponds to a change of x10 in the concentration of hydrogen ions. Try Again

24. A B HNO3 H+ + NO3- HNO3 + 2H2SO4 NO2+ + 2HSO4- + H3O+ C HNO3 + CH3COOH CH3COOH2+ + NO3- HNO3 + H2O H3O+ +NO3- D Question 12 In which of the following reactions does the nitric acid molecule act as a base?

25. Wrong Answer! The sulfuric acid molecule is deprotonated. Try Again

26. A 0.2 mol Na2CO3 B 0.1 mol NH3 C 0.1 mol Ba(OH)2 0.1 mol KOH D Question 13 Which of the following would exactly neutralise 100cm3 of 1 mol dm-3 sulfuric acid?

27. Wrong Answer! H2SO4 + Ba(OH)2 BaSO4 + 2H2O 0.1 mol of sulfuric acid reacts with 0.1 mol of barium hydroxide. Try Again

28. A Carbonic acid B Nitric acid C Sulfuric acid Hydrochloric acid D Question 14 Which is not a strong acid?

29. Wrong Answer! Carbonic acid is a weak acid Try Again

30. A B H3 PO4(aq) 2H+(aq)+ HPO42-(aq) H3 PO4(aq) 3H+(aq)+ PO43-(aq) C H2 PO4(aq) H+(aq)+ HPO42-(aq) H3 PO4(aq) H+(aq)+ H2PO4-(aq) D Question 15 Which equation correctly describes phosphoric(V) acid behaving as a monoprotic acid in aqueous solution?

31. Wrong Answer! A monoprotic acid releases 1 hydrogen ion per molecule in water. Try Again

32. A A Lewis acid (only) B A Lewis base (only) C A BrØnsted – Lowry base (only) Both a BrØnsted – Lowry base and a Lewis base D Question 16 Ammonia molecules in aqueous solution can be considered as:

33. Wrong Answer! The ammonia molecule has an available lone pair of electrons and is able to accept a hydrogen ion and form the ammonium ion (via a dative bond form). Try Again

34. Congratulations! You have completed the quiz!