Electro chemistry practice · Medium

The reduction potential of hydrogen half – cell will be negative if:

A Galvanic cell is represented as: $\mathrm{Pt}, \mathrm{H}_2(0.1 \mathrm{~bar})\left|\mathrm{H}^{+}(\mathrm{aq})(2 \mathrm{~M}) \| \mathrm{M}^{+}(0.2 \mathrm{~M})\right| \mathrm{M}(\mathrm{s})$ [Given : $\mathrm{K}_{\mathrm{w}}=10^{-14}, \mathrm{E}_{\mathrm{M}^{+} / \mathrm{M}}^{\mathrm{o}}=0.03 \mathrm{~V}$]. The correct statement for the given Galvanic cell is:

Which of the following solutions of ${KCl}$ will have the highest value of specific conductance?

Effect of dilution on conductivity of solution:

The electrolytic bath used in gold plating of copper articles contains :

Consider the following reaction at $1100^{\circ} \mathrm{C}$.
(1) $2 \mathrm{C}+\mathrm{O}_2 \longrightarrow 2 \mathrm{CO} \,\Delta \mathrm{G}^{\circ}=-460 \mathrm{~kJ} \mathrm{~mol}^{-1}$
(2) $2 \mathrm{Zn}+\mathrm{O}_2 \longrightarrow 2 \mathrm{ZnO} \,\Delta \mathrm{G}^{\circ}=-360 \mathrm{~kJ} \mathrm{~mol}^{-1}$
based on these, select correct alternate

A dilute solution of sulphuric acid is electrolysed using a current of $0.10 \mathrm{~A}$ for 2 hours to produce hydrogen and oxygen gas. The total volume of gases produced at STP is ____$\mathrm{cm}^3$. (Nearest integer)
[Given : Faraday constant $\mathrm{F}=96500 \mathrm{C} \mathrm{mol}^{-1}$ at STP, molar volume of an ideal gas is $22.7 \mathrm{~L} \mathrm{~mol}^{-1}$ ]

Which of the following aqueous solution will have the maximum specific conductance?

Two half cells have reduction potentials $-0.76 \mathrm{~V}$ and $0.13 \mathrm{~V}$ respectively. A galvanic cell is made from these two half cells. Which of the following statements is correct?

Conductivity (Seimen's $S)$ is directly proportional to area of the vessel and the concentration of the solution in it and is inversely proportional to the length of the vessel, then constant of proportionality is expressed in:

The value of electronic charge is equal to :

Which does not get oxidised by bromine water?

Equivalent conductance of $0.1 \mathrm{~M} \mathrm{~HA}$ (weak acid) solution is $10 \mathrm{~S~cm}^2 \mathrm{~equivalent}^{-1}$ and that at infinite dilution is $200 \mathrm{~S~cm}^2 \mathrm{~equivalent}^{-1}.$ Hence $\mathrm{pH}$ of $\mathrm{HA}$ solution is

Consider the following ${E^\mathrm{o}}$ Values.
$E_{F{e^{3 + }}/F{e^{2 + }}}^\mathrm{o} = 0.77\,V\,;\,E_{S{n^{2 + }}/Sn}^\mathrm{o} = - 0.14\,V$
Under standard conditions, the potential for the reaction:
$Sn\left( s \right) + 2F{e^{3 + }}\left( {aq} \right) \to 2F{e^{2 + }}\left( {aq} \right) + S{n^{2 + }}\left( {aq} \right)$

Calculate $K_{\mathrm{a}}$ of acetic acid if its $0.05 \mathrm{~M}$ solution has molar conductivity of $7.814 \times 10^{-4} \, \Omega^{-1} \mathrm{~m}^2 \mathrm{~mol}^{-1}$ at $25^{\circ} \mathrm{C}.$ Given: $\Lambda_{\mathrm{m}}^{\circ}$ for $\mathrm{CH}_3 \mathrm{COOH}=3.907 \times 10^{-2} \, \Omega^{-1} \mathrm{~m}^2 \mathrm{~mol}^{-1}.$

Which of the following has negative value?

When 1 F of electricity is passed through acidulated water, ${\mathrm{O}_2}$ evolved is

The product, which is not obtained during the electrolysis of brine solution is

Which cell will measure standard electrode potential of copper electrode?

Resistance of a $0.1 \mathrm{~M} \mathrm{~KC1}$ solution in a conductance cell is $300 \mathrm{~ohm}$ and specific conductance of $0.1 \mathrm{~M} \mathrm{~KC1}$ is $1.33 \times 10^{-2} \mathrm{~ohm}^{-}$ ${ }^1 \mathrm{~cm}^{-1}$. The resistance of $0.1 \mathrm{M} \mathrm{~NaCl}$ solution in the same cell is $400 \mathrm{~ohm}$. The equivalent conductance of the $0.1 \mathrm{~M} \mathrm{~NaCl}$ solution (in ohm ${ }^{-1} \mathrm{~cm}^2 /$ gmeq.) is