Which of the following electrolytic solutions has the least specific conductance?

• 0.02N

• 0.2 N

• 2 N

• 0.002 N

Hydrogen gas is not liberated when the following metal is added to dil HCl

• Ag

• Zn

• Mg

• Sn

The standard electrode potential for the half-cell reactions are

Zn²⁺ + 2e^- → Zn; E° = -0.76 V

Fe²⁺ + 2e^- → Fe; E° = 0.44 V

The emf of the cell reaction, Fe²⁺ + Zn → Zn²⁺ + Fe is

• -0.32 V

• -1.20 V

• +1.20 V

• +0.32 V

In the electrolysis of acidulated water, it is desired to obtain 1.12 cc of hydrogen per second under STP condition. The current to be passed is

• 1.93 A

• 9.65 A

• 19.3 A

• 0.965 A

The one which decreases with dilution is

• molar conductance

• conductance

• specific conductance

• equivalent conductance

9.65 C of electric current is passed through fused anhydrous magnesium chloride. The magnesium metal thus, obtained is completely converted into a Grignard reagent. The number of moles of the Grignard reagent obtained is

• 5 × 10^-4

• 1 × 10^-4

• 5 × 10^-5

• 1 × 10^-5

The standard emf of galvanic cell involving 3 moles of electrons in its redox reaction is 0.59 V. The equilibrium constant for the reaction of the cell is

• 10²⁵

• 10²⁰

• 10¹⁵

• 10³⁰

E₁, E₂ and E₃ are the emfs of the following three galvanic cells respectively.

(i) Zn (s) | Zn²⁺ (0.1 M) || Cu²⁺ (1M) | Cu (s)

(ii) Zn (s) | Zn²⁺ (1 M) || Cu²⁺ (1M) | Cu (s)

(iii) Zn (s) | Zn²⁺ (1 M) || Cu²⁺ (0.1M) | Cu (s)

Which one of the following is true?

• E₂ > E₁ > E₃

• E₁ > E₂ > E₃

• E₃ > E₁ > E₂

• E₃ > E₂ > E₁

199.

The standard emf of a galvanic cell involving 2 moles of electrons in its redox reaction is 0.59 V. The equilibrium constant for the redox reaction of the cell is

• 10²⁰

• 10⁵

• 10

• 10¹⁰

9.65 C of electric current is passed through fused alyhdrous MgCl₂. The magnesium metal thus obtained is completely converted into a Grignard reagent. The number of moles of Grignard reagent obtained is

• 5 × 10^-4

• 1 × 10^-4

• 5 × 10^-5

• 1 × 10^-5