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18.04.2006

Факультет иностранных учащихся. Кафедра химии. Пример теста по общей химии

Department of Chemistry
Final attestation on General Chemistry. Written test.
Example.

1. Endothermic reactions:
(a) cannot proceed spontaneously at any temperatures;
(b) can proceed at sufficiently low temperatures;
(c) can proceed at sufficiently high temperatures if the change of the entropy of the reaction is positive;
(d) can proceed if the change of the entropy of the reaction is negative;
(e) cannot proceed at sufficiently high temperatures.

2. Salts hydrolyzing only by anion are:
(a) potassium acetate; (b) potassium chloride; (c) potassium hydrophosphate;
(d) ammonium acetate; (e) copper(II) acetate.

3. The correct formula for calculation of the depression of freezing point of a non-electrolyte solution is:
(a) DTf = Kcr ∙ C(X);
(b) DTf = i ∙ Kcr∙ Cm(X);
(c) DTf = i ∙ Kcr ∙ C(X);
(d) DTf = Kcr ∙ Cm(X);
(e) DTf = Kcr ∙ S(X).

4. The geometry of molecule of complex compound containing the central atom with coordination number equals to 2 is:
(a) linear; (b) tetrahedral; (c) octahedral;
(d) square planar; (e) trigonal.

5. How much the surface activity of methanol is less then the surface activity of propanol in aqueous solutions?
(a) 3.2 times; (b) 32.8 times; (c) 6.4 times;
(d) 9.6 times; (e) 10.2 times.

6. A catalyst affects:
(a) the activation energy; (b) the reaction rate; (c) the enthalpy of a reaction;
(d) the overall DGo; (e) the reaction mechanism.

7. A metal electrode coated with a precipitate or complex in contact with a solution containing another metal that reacts with the precipitate anion or complexing agent is:
(a) ion-metal electrode of the Ist kind; (b) ion-metal electrode of the IInd kind;
(c) ion-metal electrode of the IIIrd kind; (d) ion-selective electrode;
(e) inert electrode.

8. The redox potential dependence on the ligand surroundings is a combination of the following equilibria:
(a) protolytic – heterogeneous; (b) protolytic – ligand-replacement;
(c) protolytic – redox; (d) heterogeneous – ligand-replacement;
(e) ligand-replacement – redox.


9. Which p-element is the most electronegative?
(a) Phosphorus; (b) Fluorine; (c) Lead; (d) Selenium; (e) Sulphur.

10. The dispersion medium pH value is 8.0. Which of the following proteins are charged negatively?
(a) Fibrinogen (IEP»6) (b) g-Globulin (IEP » 6.5) (c) Hemoglobin (IEP»7)
(d) Lysozyme (IEP»11) (e) Protamine (IEP » 12)

Answers
1. c 6. a, b, e
2. a, c 7. c
3. d 8. e
4. a 9. b
5. e 10. a, b, c