Secondary Cells

Q. The pressure of h2 required to make the potential of h2 electrode zero in pure water at 298k is-

Q.

Predict the products of electrolysis in a dilute solution of ${\mathrm{H}}_2{\mathrm{SO}}_4$ with platinum electrodes.

Q.

Predict the products of electrolysis in an aqueous solution of ${\mathrm{AgNO}}_3$ with Silver electrodes.

Q.

Predict the products of electrolysis in an aqueous solution of ${\mathrm{AgNO}}_3$ with Platinum electrodes.

Q.

Predict the products of electrolysis in an aqueous solution of ${\mathrm{CuCl}}_2$ with platinum electrodes.

Q. the coagulation values in millimoles/litre of electrolytes used for coagulation of As2S3 are given below: 1)NaCl=52 2)BaCl2=0.69 ( 3) MgSO4=0.22.The correct order of their coagulating power is?

Q.

Explain the reactions:

a. $2KI+C{l}_2\to 2KCl+I_2$

Q. Reduction potential of a hydrogen electrode by keeping pressure of H_2 as 1 bar (at 298K) at pH 10 a. -0.592V b. 0.342V c. 0.592V d. 10

Q.

The combination of two or more cells is called a ____

Q.

Why do we use sulfuric acid in batteries?

Q. Consider the cell Cu / Cu^2+ | | Ag^+ / Ag. if the concentration of Cu^2+ and Ag^+ ions becomes ten times the emf of the cell :- (1) Becomes 10 times (2) Remains same (3) Increase by 0.0295 V (4) Decrease by 0.0295 V

Q.

A metal used in storage batteries is_______

Q.

What does electrolysis of salt water produce?

Q. The electric charge for electrode deposition of one gram equivalent of a substance is:

1. One ampere per second
2. $96,500$ coulombs per second
3. One ampere for one hour
4. Charge on one mole of electrons

Q. 22. The EMF of a concentration cell consisting of two Zn electrodes, one dipping into M/4 solution of zinc sulphate and the other into M/16 solution of the same salt at 25 degree celsius is : 1. 0.0125 V 2. 0.0250 V 3. 0.0178 V 4. 0.0356 V

Q.

Complete the following:
Electrolysis of aqueous magnesium chloride (Pt electrodes)

${\mathrm{MgCl}}_2\left(\mathrm{aq}\right)\rightleftharpoons \dots \dots .\dots \dots +\dots$

${\mathrm{H}}_2\mathrm{O}\rightleftharpoons ..........+..........$

At cathode:…….$+1e^{-}⟶$…..

…….+……. $\to$ ${\mathrm{H}}_2$
At anode: $C{l}^{-}\to$…….+…….

…..+…. $\to {\mathrm{Cl}}_2$

Q. Write the name of the cell which is generally used in hearing aids. Write the reactions taking place at the anode and the cathode of this cell.

Q. On increasing the dilution of an electrolytic solution, it' s conductivity:

1. increases
2. decreases
3. remain unchanged
4. first increases and then decreases

Q.

For a cell reaction Cu(s) + 2Ag⁺ (aq) → Cu ²⁺+ 2 Ag⁺ (aq) the standard cell potential is 0.46V . By doubling the concentration of Copper(II) ions, The standard cell potential will get:-

1. increases by less than two

2. no change

3. Halved

4. double

Q. Calculate the concentration of electrolyte ($C_1$) at anode for the given cell:

$Ag\left(s\right)|AgN{O}_3(aq,C_{1}M)||AgN{O}_3(aq,C_2=0.2M)|Ag\left(s\right)$

The emf of the cell is $0.8V$

Take
$Antilog\left(13.5\right)=3.16\times {10}^{13}$

1. $C_1=0.63\times {10}^{-14}$
2. $C_1=3.16\times {10}^{13}$
3. $C_1=3.16\times {10}^{-13}$
4. $C_1=6.32\times {10}^{13}$

Q.

Among the following, the number of metal/s which can be used as electrodes in the photoelectric cell is _____ (integer answer).

1. $\mathrm{Li}$

2. $\mathrm{Na}$

3. $\mathrm{Rb}$

4. $\mathrm{Cs}$

Q.

How do you test a dry cell battery?

Q. 2 The standard half reduction potential of Ag+|Ag is 0.79V is 25^° C. Given the experimental value Ksp=1.5 10*-10 for AgCl, calculate the standard half cell reduction potential for the Ag|AgCl electrode. 1) 0.21 V 2) -0.21 V 3) -1.21V 4) 1.21V

Q. 8 What is the half cell reaction of pt(s) | Hg(l) | Hg2Cl2(s) | Cl-(aq).

Q. The packing efficiency of teo dimensional square unit cell shown below is

Q.

The internal resistance of dry cells is ________than the common electrolytic cells?

Q. Electrode potential data of few cells is given below. Based on the data, arrange the ions in increasing order of their reducing power :- Fe3+(aq) + e– → Fe2+(aq); E° = +0.77 V Al3+(aq) + 3e– → Al(s); E° = –1.66 V Br2(aq) + 2e– → 2Br–(aq); E° = +1.09 V (1) Br– < Fe2+ < Al (2) Fe2+ < Al < Br– (3) Al < Br– < Fe2+ (4) Al < Fe2+ < Br–

Q. 10. A potential difference of 20V applied to the ends of a cloumn M10 AGNO3 solution, 4 centimeters in diameter and 12cm in length gave a current of 20 ampere. What is the molar concentration of the solution?

Q.

The following questions are related to the extraction of aluminum by electrolysis. (i) Name the other aluminum-containing compound added to alumina and state its significance. (ii) Give the equation for the reaction that takes place at the cathode. (iii) Explain, why is it necessary to renew the anode periodically?

Q. Choose the correct option(s) regarding transport number:
Here,
$t_{+}\text{is the transport number of cation}$
$t_{-}\text{is the transport number of anion}$
${\Lambda }_{+}\text{is the molar conductance of cation}$
${\Lambda }_{-}\text{is the molar conductance of anion}$

1. For an ionic solution, current carried by an ion depends upon the speed of the ion.
2. For an ionic solution, current carried by an ion does not depend upon the speed of the ion.
3. $\frac{t_{+}}{t_{-}}=\frac{{\Lambda }_{+}}{{\Lambda }_{-}}$
4. $\frac{t_{+}}{t_{-}}=\frac{{\Lambda }_{-}}{{\Lambda }_{+}}$