## Important Questions of Electrochemistry

#### 1. (a) What is the difference between metallic and electrolytic conduction?

#### (b) What do you understand by (i) Electrolytic conductance (ii) Specific conductance.

#### 2. Explain the following:

#### (i) Conductance of an electrolytic solution increases with temperature where as that of a metal decreases.

#### (ii) Specific conductance decreases on dilution of an electrolyte whereas equivalent conductance increases.

#### (iii) Significance of Kohlrausch’s law of independent migration of ions.

#### 3. State and explain Kohlrausch’s law of independent migration of ions. How do you experimentally determine the degree of dissociation of a weak electrolyte in solution?

#### 4. Describe briefly the Arrhenius theory of electrolytic dissociation. What are its limitations?

#### 5. State and explain the Ostwald’s dilution law. Why is the law not applicable in case of strong electrolytes?

#### What is the transport number of an ion? Describe (1) Hittorts method. (2) Moving boundary method employed in determining the transport number of an ion.

#### A contain current was passed through a solution of AuCI; ions between gold electrodes. After a period of 10.00 minutes the cathode increased in weight by 1.314 grams. How much charge was passed and what was the current I?

#### Ans: q= 2×10^{4}Faraday. I= 3.22Ampere.

#### The measured resistance of a cell containing exactly 0.1g. equivalent of KC1 in 1000 ml. at 25

^{°}C was found to be 3468.9 ohms; the specific conductance of. the solution is known to be 0.012855011m^{-I}cni^{i}at 25^{°}C. An exactly 0.1 N solution of another substance in the same cell had a resistance of 4571.5 ohms. Calculate the equivalent conductance of this electrolyte at the given concentration. (The conductance of the water is so small that it may be neglected.) Ans: A = 97.51 ohni^{l}cm^{-I}.#### A solution of AgNO3 containing 0.0074 g per gram of water was electrolysed using silver electrodes. During the experiment, 0.0785 g of Ag was deposited in a silver voltameter. At the end of electrolysis, 25 g of anode solution contained 0.2553 g of AgNO3. Calculate the transport number of NO3

^{–}ion. (Atomic weight of Ag = 108; N-14, 0=16) Ans. 0.569.#### The transference numbers of the ions in 1.00N KCI were determined by the moving boundary method using 0.8014 BaC12 as the following solution. With a current of 0.0142 amp., the time required for the boundary to sweep through a value of 0.1205c.c. was 1675 sec. What are the transport numbers-of le and Cr ions? Ans; t.= 0.40. 1= 0.60

## Important Questions Notes Electrochemistry

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