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化学专业英语练习题
Final Examination Paper Ⅰ
Ⅰ. Monochoice questions
依数性6. The red blood cell will be shrinkable in which solution listed below?（ ）
A. 10.0 g·L-1CaCl2·2H2O(Mr＝147) B. 12.5g·L-1NaHCO3(Mr＝84.0)
C. 1.00 g·L-1NaCl D. 224g·L-1C3H5O3Na(Mr＝112)
11. There are four water solutions of the equal volume in which there are equal mass of glucose, CaCl2, NaHCO3 and sucrose respectively. Then whose freezing-point is the lowest? ( )[Mr(glucose)180( HAc)60(Na2CO3)106 (CaCl2) 111]
A. Glucose B. HAc C. CaCl2 D. Na2CO3
12. Which choice listed below is isotonic solution? ( )
A. 5% glucose solution and 5% sucrose solution
B. 1 mol·L-1 glucose solution and 0.5 mol·L-1 sucrose solution
C. 0.5 mOsmol·L-1 urea solution and 0.5 mOsmol·L-1 NaCl solution
D. 0.5 mol·L-1 MgSO4solution and 0.5 mol·L-1 CaCl2 solution
电解质9. We learn that the Ka of HF is 3.53×10-4 and the Kb of NH3·H2O is 1.79×10-5, then which option following is true?( )
A. NH4＋ is a stronger acid than HF
B. NH4＋ is a weaker acid than HF
C. the acidic strength of NH4＋ and HF are equal.
D. can not do the compare
13. A solution was prepared by mixing equal volume of 0.10mol·kg－1NH4Cl and 0.10mol·kg－1NH3·H2O, its ionic strength ( I ) is ( ) mol·kg－1.
A. 0.05 B. 0.075 C. 0.10 D. 0.15
14. 0.10mol NaOH and 0.10mol HAc are dissolved into 1.0L distilled water together, please calculate the pH of this solution( ) (Ka(HAc)=1.74×10－5)
(A) 10.28 B. 11.28 C. 8.88 D. 12.28
15. There is 1L 0.1mol·L－1H2CO3 solution with the addition of 0.5ml 0.1mol·L－1 HCl solution. Which choice listed below is true? ( )
A. pH decrease, dissociation degree of H2CO3 decrease.
B. pH decrease, dissociation degree of H2CO3 increase.
C. pH increase, dissociation degree of H2CO3 increase.
D. pH increase, dissociation degree of H2CO3 decrease.
缓冲溶液16.The buffer range of a buffer solution prepared by mixing 500ml 0.4mol·L-1 H2CO3 solution and 200ml 0.4mol·L-1 NaOH is about ( ). (pKa1=6.37; pKa2=10.25 )
A. 1.12～3.12
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