Analytical Chemistry ( Second ) ❤️

28 Questions | By Pharmacgy | Last updated: Mar 20, 2022 | Total Attempts: 86

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اللهم رحمة و نور لعمر وتالا ❤️

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1.

All of these sentences are correct except :
- A.
  
  K_eq⁰ takes in consideration the ionic strength
- B.
  
  K_eq = k_eq⁰ anly at f_i < 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 k_eq⁰ = 2*10^-8 . calculate the % dissociation in the presence of 0.1 M diverse salt ( f_A = 0.6 , f_B= 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 ( k_eq).
- A.
  
  True
- B.
  
  False
5.

K_eq , pk_a , 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 , k_a = 6.3*10^-5 in the presence of 0.05 M k₂SO₄ ( a_H = 9 Angstrom , a_C_6H5COO = 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* [SO_4^-2]
- B.
  
  [OH^-] + [Na⁺] = [SO_4^-2] + [H⁺]
- C.
  
  [Na⁺] + [H⁺] = [OH^-] + [SO_4^-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 k_eq 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 k_eq nor the position of chemical reactions :
- A.
  
  Temperature
- B.
  
  Pressure
- C.
  
  Catalyst
16.

The wrong sentence is :
- A.
  
  The larger k_eq of an acid , the stronger will be acid
- B.
  
  K_eq 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^-₄is
- 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 NH₃is 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