2) Metals with the greatest value of the electrode potential

3) Discharged anions with the lowest value of the reducing potential

4) Discharged anions with the greatest value of the reducing potential

5) Discharged water

68. In the electrochemical series metals are arranged ...

1) in the order of weakening metal solubility in water

2) depending on the resistance to oxidation by oxygen

3) In the order of increasing the electrode potential

4) in the order of decreasing the electrode potential

5) depending on the resistance to oxidation by strong acids

69. The Nernst equation is described by:

1)

2)

3)

4)

5)

70. What metals will react with diluted acids, as HCl and H₂SO₄, and produce hydrogen gas?

1) Cd, Hg

2) Ca, Cu

3) Au, Ag

4) Zn, Ag

5) Al, Zn

71. What metals will not react with diluted acids?

1) Zn, Fe

2) Pt, Au

3) Ni, Mg

4) Au, Cа

5) Cd, Cu

72. Which of the following metal ions will discharge first at electrode?

1) Ag⁺ (E° = +0,80V)

2) Cu²⁺ (E° = +0,34V)

3) Fe²⁺ (E° = -0,44V)

4) Al³⁺ (E° = -1,66V)

5) H⁺ (E° = 0V)

73. Which of the following metal ions, as Al³⁺, Na⁺, Mg²⁺, Ag⁺, will discharge first at electrode during molten electrolysis?

1) Na⁺ , Ag⁺ , Al³⁺ , Mg²⁺

2) Ag⁺, Al³⁺, Mg²⁺, Na⁺,

3) Ag⁺, Na⁺, Mg²⁺, Al³⁺

4) Mg²⁺, Al³⁺, Na⁺, Ag⁺

5) Al³⁺, Na⁺, Mg²⁺, Ag⁺

74. The process of redox decomposition of an ionic compounds by passing electricity through molten compounds or aqueous solutions of compounds is called:

1) dissociation

2) oxidation

3) hydrolysis

4) Electrolysis

5) corrosion

75. Select the definition of Faraday's 1^st law:

1) The mass of a substance produced at an electrode during electrolysis is proportional to the number of moles of electrons (the quantity of electricity) transferred at that electrode

2) The mass of a substance deposited or liberated at any electrode on passing a certain amount of charge is directly proportional to its chemical equivalent weight

3) For non-electrolyte solutions, the partial vapor pressure of a solvent over a solution (P₁) is equal to the vapor pressure of the pure solvent (P₀) multiplied by the mole fraction of the solute (X₂).

4) At constant temperature, the rate of a chemical reaction is directly proportional to the product of the molar concentrations of reacting species, with each concentration term raised to the power equal to the numerical coefficient of the species in the chemical equilibrium

5) A chemical compound always contains exactly the same proportion of elements by mass.

76. Select cause of electrochemical corrosion:

1) Metal react with acid

2) Metal react with alkili

3) Metal react with water

4) Metal react with non-electrolyte liquid

5) Any two metals with different potentials in contact, dipped in an electrolyte.

77. The chemical destruction of metal in fluids, electrolytes which are not is called: