Representation of Cell

Q.

Describe the working of the calomel electrode?

Q.

Identify the oxidizing agent (oxidant) in the following reactions : $\mathrm{CuO}+{\mathrm{H}}_2\to \mathrm{Cu}+{\mathrm{H}}_2\mathrm{O}$

Q.

If a salt bridge is removed between two half cells, the voltage:

1. decreases to half the value

2. drops to zero

3. doubles

4. does not change

Q.

Explain how anhydrous Copper sulphate can be used in the detection of water.

Q.

The EMF of a cell is related to the equilibrium contant of the cell reaction as

1. 

2. 

3. 

4. 

Q. Which one of the following does not decolourize an acidified $KMn{O}_4$ solution.

1. $S{O}_2$
2. $FeC{l}_3$
3. $H_2{O}_2$
4. $FeS{O}_4$

Q.

The cell representation of the given reactions is:

Zn(s) + 2Ag⁺ → Zn²⁺ + 2Ag(s)

1. Ag|Ag⁺||Zn²⁺|Zn

2. Zn²⁺|Zn||Ag|Ag⁺

3. Ag⁺|Ag||Zn|Zn²⁺

4. Zn|Zn²⁺||Ag⁺|Ag

Q.

What is Electrolysis in Chemistry?

Q. Catalyst A reduces the activation energy for a reaction by $10{\text{kJ mol}}^{-1}$ at $300K$. The ratio of rate constants, $\frac{{}^{k}T,\text{Catalysed}}{{}^k\text{T, Uncatalysed}}$ is $e^x$. Calculate the value of $x$ (nearest integer).
[Assume that the pre - exponential factor is same in both the cases. and take value of $R=8.31J{K}^{-1}{\text{mol}}^{-1}]$

Q.

$\mathrm{ZnO}\left(\mathrm{s}\right)+\mathrm{C}\left(\mathrm{s}\right)\to \mathrm{Zn}\left(\mathrm{g}\right)+\mathrm{CO}\left(\mathrm{g}\right)$ which substance is oxidized, reduced, and oxidizing agent?

Q.

Aluminium displaces hydrogen from dilute HCL whereas silver doesnot.The emf of a cell prepared by combining AL/AL*3+ is 2.46 V.The reduction potential of silver electrode is +0.80V.the reduction potential of alluminium electrode is

Q. The efficiency of a fuel cell is given by

1. $\frac{\Delta G}{\Delta H}$
2. $\frac{\Delta H}{\Delta G}$
3. $\frac{\Delta G}{\Delta S}$
4. $\frac{\Delta S}{\Delta G}$

Q. MnO4+i__>mno2+i2 half cell method

Q. ch3ch2cl reacts with kcn to form a ch3ch2nc b ch3ch2cn c c h3ch2nh2 d ch3ch2ch2nh2

Q.

$\mathrm{ZnO}\left(\mathrm{s}\right)+\mathrm{C}\left(\mathrm{s}\right)\to \mathrm{Zn}\left(\mathrm{g}\right)+\mathrm{CO}\left(\mathrm{g}\right)$ which type of reaction is this?

Q. Describe the construction and working of calomel electrode.

Q. The calomel electrode is reversible with respect to

1. Mercury

2. Hg2+

3. H+

4. Cl-

Q.

If the standard hydrogen electrode acts as an anode, the reaction at anode will be:

1. H₂ (g) → H⁺ (aq) + e^-

2. H₂ (g) → 2H⁺ (aq) + 2e^-

3. H⁺ (aq) + e^-→ H₂ (g)

4. 2H⁺ (aq) + 2e^-→ H₂ (g)

Q.

Why alternating current used for measuring resistance of an electrolytic solution?

Q.

Work done by an electrochemical cell is equal to:

1. Faraday's constant

2. Increase in Gibbs energy

3. Electrode potential

4. Decrease in Gibb's energy

Q. $H_{2}S{O}_4$ acts as a strong oxidising agent. In which of the reaction, is it not acting as an oxidising agent?

1. $Cu+2H_{2}S{O}_4\to CuS{O}_4+S{O}_2+2H_{2}O$
2. $C+2H_{2}S{O}_4\to C{O}_2+2S{O}_4+H_{2}O$
3. $Ca{F}_2+2H_{2}S{O}_4\to CaS{O}_4+2HF$
4. $S+2H_{2}S{O}_4\to 3S{O}_2+H_{2}O$

Q. 3. During discharging of lead-storage acid batteryfollowing reaction takes placePb(s) + PbO2 (s) + 2H2SO.2PbSO 4(s) + 2H2O4If 2.5 A of current is drawn for 965 min, H, SO4consumed is(a) 0.75 mol(c) 1.50 mol(b) 3.00 mold) 4.50 mol

Q. In an electrochemical cell, what are the carriers of current? electrons or ions, and how?

Q. 76 Two weak acid solutions HA1 and HA2 each with the same concentration and having pka values 3 and 5 are placed in contact with a hydrogen electrode (1atm, 25 degrees celsius) and are interconnected through a salt bridge. Calculate the emf of the cell.

Q.

which of the following will form the cathode with respect to iron anode in an electrolytic cell:

a)Mg

b)Al

c)Cu

d)Zn

[Doubt: pls explain Concept and reason for answer]

Q.

Eº for the reaction

Fe + Zn2+ = Zn + Fe2+ is - 0.35 V.

The given cell reaction is

1. in equilibrium

2. None

3. not feasible

4. feasible

Q.

Is galvanic cell same as electrochemical cell ?

Q. Consider the following reaction
$Mn{O}_4^{-}+8H^{+}+5e^{-}\to M{n}^{+2}+4H_{2}O,E^o=1.51V.$

The quantity of electricity required in Faraday to reduced five moles of $Mn{O}_4^{-}$ is
(Integer answer)

Q.

What does cyclic voltammetry tell you?

Q.

What is the another name of fuel cell?