Analytical Chemistry ( Second ) ❤️
اللهم رحمة و نور لعمر وتالا ❤️
- 1.All of these sentences are correct except :
- A.
Keq0 takes in consideration the ionic strength
- B.
Keq = keq0 anly at fi < 1
- C.
When there is an ionic strength , the molar conc. is not equal to the effective concentration
- 2.All of these sentences about activity coefficient are correct except :
- A.
( f =1 ) , for undissociated acid
- B.
f is a function of the total electrolyte concentration of the solution
- C.
The activity coefficient is more accurate in mixed electrolyte solution than in single one
- 3.1*10-4 M of a weak electrolyte AB , dissociates to A+ & B- with keq0 = 2*10-8 . calculate the % dissociation in the presence of 0.1 M diverse salt ( fA = 0.6 , fB = 0.7 )
- A.
2.6 %
- B.
1.4 %
- C.
4.1 %
- D.
2.2%
- 4.In case of combination of 2 ionic species , the addition of diverse salt shifts the reaction to the left ( reactant باتجاه ال ) & decreases Complex's formation constant ( keq).
- A.
True
- B.
False
- 5.Keq , pka , PH are independent on ionic strength for the reaction involving chared species
- A.
True
- B.
False
- 6.Calculate the precent dissociation for 0.09 M HCN
- A.
0.27 %
- B.
0.012 %
- C.
0.009 %
- D.
0.027 %
- 7.Calculate the PH of a solution of 5*10-3 M C6H5COOH , ka = 6.3*10-5 in the presence of 0.05 M k2SO4 ( aH = 9 Angstrom , aC6H5COO = 6 Angstrom )
- A.
3.25
- B.
2.18
- C.
3.18
- D.
3.6
- 8.It is based on the low of conservation and # of atom in the reaction is constant
- A.
Mass balance equation
- B.
Debye and Huekel equation
- C.
Charge balance equation
- 9.The charge balance equation of 2 moles of Na2SO4 that is added into 1 L water is :
- A.
[Na+] + [H+] = [OH-] +2* [SO4-2]
- B.
[OH-] + [Na+] = [SO4-2] + [H+]
- C.
[Na+] + [H+] = [OH-] + [SO4-2]
- 10.One of these sentences is incorrect during adding a diverse salt to an aqueous solution :
- A.
An increase in the dissociation of a weak electrolyte
- B.
The diverse ion shields the ions of weak acid
- C.
Increase the effective conc.
- D.
Effect keq value
- 11.Calculate the ionic strength of 0.2 M solution of KNO3 and 0.2 M of Al2SO3
- A.
0.2
- B.
3
- C.
3.2
- D.
0.6
- 12.Very weak acid dont contribute to the ionic strenght
- A.
True
- B.
False
- 13.Which of the following is stating that : " the rate of a chemical reaction is proportional to the active masses of the reacting substances present any time " :
- A.
Le Chatelier principle
- B.
Mass balance equation
- C.
The low of mass action
- 14.The reaction " A + B <-------> 2C + D + Heat " will procced from right to left when :
- A.
Sufficient conc. of C is present
- B.
Increase the temprature
- C.
Increase [D]
- D.
Increase the pressure
- E.
All of the above
- 15.One of the following does not affect neither keq nor the position of chemical reactions :
- A.
Temperature
- B.
Pressure
- C.
Catalyst
- 16.The wrong sentence is :
- A.
The larger keq of an acid , the stronger will be acid
- B.
Keq value depends on the solvent of the rxn
- C.
The equilibrium constant give an idea about the rate of reaction how to fast
- 17.The conjugate base H2PO-4 is
- A.
H3PO4
- B.
HPO4-2
- C.
PO4-3
- D.
None of the above
- 18.The pH, POH, [OH-] respectively 2*10-5 HNO3
- A.
9.3, 4.69, 5*10-10
- B.
8.6, 5.4, 2.5*10-9
- C.
None of the above
- 19.The correct statement of the following is
- A.
The POH for 1*10-8 M HBr is 6
- B.
Acidity increase as pka increase
- C.
PH=log1/[H+]
- 20.Solution of. 01M HA has PH=2.8, the estimated Ka of the acid is
- A.
1.6*10-3
- B.
2.5*10-5
- C.
3*10-4
- 21.Which of the following statements is not correct
- A.
A bronsted acid is an electron pair donor
- B.
A lewis base is an electron pair donor
- C.
The conjugate acid of NH3 is NH4+
- 22.The self-ionization of a solvent to give cation and anion
- A.
Autoprotolysis
- B.
Dissociation
- C.
Shielding
- 23.The normal blood PH is 7.35-7.45 this value must be measured at
- A.
25 c
- B.
37 c
- C.
36-38 c
- 24.The PH of a solution prepared by mixing 2 ml of monoprotic strong acid of PH=3 and 3 ml of monohydroxy strong base of PH=10 is
- A.
10
- B.
13
- C.
3.4
- D.
10.6
- 25.The POH of 1*10-7 M solution of HCl is
- A.
6.79
- B.
7.21
- C.
7
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