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Biochemistry Practice Test Questions: Basics of Water
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Topics covered include: Weak Interactions in Aqueous Systems, Ionization of Water, Weak acids and Weak Bases, Buffering against pH changes in Biological Systems, & Water as a Reactant.

Biochemistry Practice Test Questions: Basics of Water
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25 Questions

1. The bond dissociation energy of O-H bond in a water molecule is _____________
2. What makes water a liquid at room temperature?
3. Which of the following is an isotonic solution?
4. What trend does the reactivity of group II elements follow with water?
5. Calculate the pKa of lactic acid, given that when the concentration of lactic acid is 0.010M and the concentration of lactate is 0.087M, the pH is 4.80.
6. The bond dissociation energy of hydrogen bonds in a water molecule is ______________
7. Buffer capacity is maximum when __________
8. Which can act as buffer?
9. Assertion A: pH of a buffer solution solution does not change on dilution.
Reason R: On dilution the ration of concentration of salt and acid (or base) remains unchanged.
10. Consider the following reaction, in the presence of light
2H2O + 2X O2 + 2XH2
Which of the following statements is true?
11. What is the factor that is responsible for salts like NaCl to dissolve in water easily?
12. What is the heat of vaporization of water?
13. If pH of solution of NaOH is 12.0 the pH of H2 SO4 solution of same molarity will be?
14. Which of the following acids has the lowest pKa value?
15. Which of the following bases has the highest pKa value?
16. Which of the following is the correct equation?
17. Which of the following mixture in aqueous solution of equimolar concentration acts as a buffer solution?
18. Calculate the ratio of the concentrations of acetate and acetic acid required in a buffer system of pH 5.30.
19. Which of the following is a hypotonic solution?
20. The processes i and ii are respectively.
i) CuSO4 + 5H2O CuSO4.5H2O
21. What is the concentration of OH– in a solution with a H+ concentration of 1.3×10-4 M?
22. K1 and K2 for oxalic acid are 6.5×10-2and 6.1×10-5respectively. What will be the [OH–] in a 0.01M solution of sodium oxalate?
23. Which among the following statements is true about the following chemical reaction?
3Fe(s) + 4H2O → Fe3O4 (s) + 4H2
24. Which of the following is not a condensation reaction?
25. Calculate the pH of a mixture of 0.10M acetic acid and 0.20M sodium acetate. The pKa of acetic acid is 4.76.

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