Faraday's Second Law

Q. The weight of silver (at.wt. = 108) displaced by a quantity of electricity which displaces 5600 mL of $O_2$ at STP will be

1. 5.4 g
2. 10.8 g
3. 54.0 g
4. 108.0 g

Q. Resistance of a conductivity cell filled with a solution of an electrolyte of concentration$0.1M$ is $100ohm$. The conductivity of this solution is $1.29S{m}^{-1}$. Resistance of the same cell when filled with $0.2M$ of the same solution is $520ohm$. The molar conductivity of $0.2M$ solution of the electrolyte will be:

1. $124\times {10}^{-5}S{m}^{2}mo{l}^{-1}$

2. $124\times {10}^{-4}S{m}^{2}mo{l}^{-1}$

3. $62\times {10}^{-4}S{m}^{2}mo{l}^{-1}$

4. $62\times {10}^{-5}S{m}^{2}mo{l}^{-1}$

Q. Resistance of 0.2 M solution of an electrolyte is $50\Omega$.The specific conductance of the solution is $1.4S{m}^{-1}$. The resistance of 0.5 M solution of the same electrolyte is $280\Omega$. The molar conductivity of 0.5 M solution of the electrolyte in $S{m}^{2}mo{l}^{-1}$ is

1. $5\times {10}^3$
2. $5\times {10}^{-4}$
3. $5\times {10}^{-3}$
4. $5\times {10}^2$

Q.

Predict the products of electrolysis in each of the following:

(i) An aqueous solution of AgNO₃ with silver electrodes.

(ii) An aqueous solution of AgNO₃with platinum electrodes.

(iii) A dilute solution of H₂SO₄with platinum electrodes.

(iv) An aqueous solution of CuCl₂ with platinum electrodes.

Q.

What is the equivalent weight of silver nitrate?

Q.

Equivalent mass of ${\mathrm{KMnO}}_4$ in acidic, basic, and neutral are in the ratio of

1. 3:5:15

2. 5:3:1

3. 5:1:3

4. 3:15:5

Q.

Consider the following reaction:

${{\mathrm{MnO}}_4}^{-}+5{\mathrm{H}}^{+}+8{\mathrm{e}}^{-}\to {\mathrm{Mn}}^{2+}+4{\mathrm{H}}_2\mathrm{O}$, $E^{°}=1.51V$

The quantity of electricity required in Faraday to reduce five moles of ${{\mathrm{MnO}}_4}^{-}$ is ___________.

Q.

Calculate gram equivalent mass of $\mathrm{KOH}$.

Q.

In an electrochemical cell, the electrode having a lower reduction potential will act as:

1. Anode

2. Salt bridge

3. Electrolyte

4. Cathode

Q. How many coulombs are required for the oxidation of 1 mol of $H_2{O}_2$ to $O_2?$

1. $9.65\times {10}^{4}C$
2. $93000C$
3. $1.93\times {10}^5$
4. $19.3\times {10}^{2}C$

Q. A $KCl$ solution of conductivity $0.14S{m}^{-1}$ shows a resistance of $4.19\Omega$ in a conductivity cell. If the same cell is filled with an $HCl$ solution, the resistance drops of $1.03\Omega$. The conductivity of the $HCI$ solution is ____ $\times {10}^{-2}S{m}^{-1}$. (Round off to the Nearest Integer).

Q.

According to Faraday's first law of electrolysis the relationship between the mass of a substance deposited or liberated at any electrode is

1. directly proportional to the quantity of electricity passed through the electrolytic solution

2. mass of substance liberated is inversely proportional to the quantity of electricity passed

3. mass of substance liberated is less than the quantity of electricity passed

4. mass of substance liberated is equal to the quantity of electricity passed

Q. A current of 9.65 ampere is passed through the aqueous solution $NaCl$ using suitable electrodes for $1000s$ . The amount of $NaOH$ formed during electrolysis is :

1. $8.0g$
2. $6.0g$
3. $4.0g$
4. $2.0g$

Q. 32.CuSO4 aq electrolysed using platinum electrode. A current is passed until 1.6g of O2 liberated at anode. The amount of Cu deposited at Cathode during same time period is

Q. Which of the following represents correct order of conductivity in solids?

1. $K_{metal}>>K_{insulator}<K_{semiconductors}$
2. $K_{metal}<<K_{insulator}<K_{semiconductors}$
3. $K_{metal}<K_{semiconductors}>K_{insulator}\ne Zero$
4. $K_{metal}\simeq K_{semiconductors}>K_{insulator}=Zero$

Q.

Which uses more energy, a $250\mathrm{W}$ TV set in $1\mathrm{hr}$, or a $1200\mathrm{W}$ toaster in $10\mathrm{minutes}$?

Q. Electrode potential values depends on

1. Ionization energy
2. Sublimation energy
3. Hydration energy
4. All of these

Q. Electrolysis can be used to determine atomic masses. A current of $0.55\text{A}$ deposits $0.55\text{g}$ of a certyain metal in $100$ minutes. Calculate the atomic mass of the metal if $\text{equivalent weight}=\frac{\text{molecular weight}}{3}$.

1. $100$
2. $96.5$
3. $48.25$
4. $144.75$

Q. The electrode potential of $M^{2+}/M$ of 3d-series elements shows positive value for:

1. $Co$
2. $Cu$
3. $Zn$
4. $Fe$

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

Q.

If $\mathrm{a}$ $\mathrm{g}$ of a divalent metal gets deposited at the cathode by passing $1\mathrm{A}$of current for $30\min ,$ calculate its atomic weight.

1. $214.4\mathrm{a}$

2. $180\mathrm{a}$

3. $107.2\mathrm{a}$

4. $53.6\mathrm{a}$

Q. One $\text{g}$ equivalent of $Na$ metal is formed from electrolysis of fused $NaCl$. Number of mole of $Al$ from the fused $N{a}_{3}Al{F}_6$ with the same current passed is:

1. $1$
2. $3$
3. $\frac{1}{3}$
4. $2$

Q.

How to calculate the equivalent weight of Potassium carbonate?

Q. How many grams of silver would be deposited at cathode if $0.05d{m}^3$ of oxygen measured at NTP is liberated at the anode when silver nitrate solution is electrolysed between platinum electrodes?
(Given: Atomic mass of $Ag=108,O=16$)

1. $1.22g$
2. $0.44g$
3. $0.95g$
4. $0.33g$

Q. Which of the following reactions is not correct?

1. $2Mn{O}_2+4KOH+O_2$
   $\downarrow$
   $4KMn{O}_4+2H_{2}O$
2. $Mn{O}_4^{-}+8H^{+}5F{e}^{2+}$
   $\downarrow$
   $5F{e}^{3+}+n^{2+}+4H_{2}O$
3. $2Mn{O}^{4-}+5C_2{O}_4^{2-}+16H^{+}$
   $\downarrow$
   $2M{n}^{2+}+10C{O}_2+8H_{2}O$
4. $2N{a}_{2}Cr{O}_4+H^{+}$
   $\downarrow$
   $N{a}_{2}C{r}_2{O}_7+2N{a}^{+}+H_{2}O$

Q. The resistance of a $\frac{N}{10}KCl$ aqueous solution is $245\Omega$. If the electrodes in the cell are $4cm$ apart and area having $77c{m}^2$ each, the molar conductance of the solution will be:

1. $233Sc{m}^{2}mo{l}^{-1}$
2. $2.12Sc{m}^{2}mo{l}^{-1}$
3. $23.32Sc{m}^{2}mo{l}^{-1}$
4. $0.233Sc{m}^{2}mo{l}^{-1}$

Q. 108 g solution of $AgN{O}_3$ is electrolysed using $Pt$ electrodes by passing a charge of 0.1 F. The mass of the resultant solution left is:

1. 98 g
2. 107.2 g
3. 11.6 g
4. 96.4 g

Q. calculate volume of the gases liberated at STP if 1 l of 0.2 molar solution of CuSO4 is electrolysed by 5.79 A current for 10000 seconds

Q.

Assertion: Semiconductors are solids with conductivities in the intermediate range from ${10}^{-6}–{10}^{4}oh{m}^{-1}{m}^{-1}$.

Reason: Intermediate conductivity in semiconductors is due to partially filled valence bands

1. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
   

2. Assertion is a wrong statement but reason is correct statement.

3. Assertion is a correct statement but reason is a wrong statement.
   

4. Assertion and reason both are correct statements and reason is correct explanation for assertion.

Q.

One mole of Al is deposited by X coulombs of charge by passing through molten AlCl₃. The number of moles of Ag deposited by the same charge from silver nitrate solution is

1. 2

2. 3

3. 4

4. 1