Electro chemistry practice · Mixed difficulty

The apparatus in which electrical energy is converted into chemical energy is known as :

For the electrochemical cell, $M\left| {{M^ + }||{X^ - }} \right|X,$

${E^ \circ }({M^ + }|M) = 0.44V,{E^ \circ } = (X|{X^ - }) = 0.33V$ . From this data one can deduce that

During electrolysis of sulphuric acid, which of the following processes is possible at anode?

A. $2 {H}_2 {O}({l}) \longrightarrow {O}_2({~g})+4 {H}^{+}({aq})+4 {e}^{-} \stackrel{\ominus}{{E}_{\text {cell }}}=+1.23 {~V}$

B. $2 {SO}_4^{2-}({aq}) \longrightarrow {S}_2 {O}_8^{2-}({aq})+2 {e}^{-} \stackrel{\ominus}{{E}_{\text {cell }}}= 1.96 {~V}$

Choose the correct option based on following statements.

(i) Process A is preferred at higher concentration of sulphuric acid.

(ii) Process B is preferred at higher concentration of sulphuric acid.

(iii) Process A is preferred for dilute sulphuric acid.

(iv) Process B is preferred for dilute sulphuric acid.

(v) Both A and B are equally possible at higher concentration.

An apparatus used for the measurement of quantity of electricity is known as a :

Assertion: The degree of dissociation of a weak electrolyte depends on the nature of the electrolyte as well as on the concentration of the electrolyte.

Reason: The degree of dissociation of a weak electrolyte is directly proportional to the square root of the concentration of the electrolyte.

Assertion: Conductivity of metals decreases with increase of temperature whereas that of electrolytic solution increases.

Reason:Electrons in metals are very tightly held by the nucleus and are not free to move.

For the reduction of silver ions with copper metal, the standard cell potential is 0.46 V at ${25^ \circ }C$. The value of standard Gibbs energy $\Delta {G^ \circ }$ will be :

${10^{ - 2}}$ g atom of Ag can be oxidised to $\mathrm{A}{\mathrm{g}^ + }$ during the electrolysis of $\mathrm{AgN}{\mathrm{O}_3}$ solution using silver electrode by :

The conductivity of $N/50$ solution of $\mathrm{KCl}$ in a cell at 250C is $0.002765{\kern 1pt} {\kern 1pt} {\rm{mho {\kern 1pt}{\kern 1pt} c}}{\mathrm{m}^{ - 1}}$ . If the resistance of a cell containing this solution is 400 ohm, the cell constant is :

Which substance is obtained in the solution on electrolysis of aqueous $\mathrm{CuS}{\mathrm{O}_4}$ solution using graphite electrodes?

Which of the following electrolytes is used in lead storage battery?

Statement-I: The voltage of mercury cell remains constant for long period of time.

Statement - II: The net cell reaction does not involve active species(ions) .

The correct order of electro chemical equivalent (e) of Sodium, Magnesium and Aluminium is

The resistance of a decinormal solution of a salt occupying a volume between two platinum electrodes 1.80 cm apart and $5.4\mathrm{c}{\mathrm{m}^2}$ in area was formed to be 32 ohm. The specific and equivalent conductivity respectively in their proper units are :

The laws of electrolysis ware proposed by

Resistance of 0.2 M solution of an electrolyte is $50{\kern 1pt} {\kern 1pt} \Omega$ . The specific conductance of the solution is 1.3 S ${\mathrm{m}^{ - 1}}$.
If resistance of the 0.4 M solution of the same electrolyte is 260Ω , its molar conductivity is

The electrolysis of a solution resulted in the formation of ${\mathrm{H}_2}$ at the cathode and $\mathrm{C}{\mathrm{l}_2}$ at the anode. The liquid is:

Anode in the Leclanche cell is

In a galvanic cell, which is wrong?

Specific conductivity of a solution

Statement (S): Conductivity of weak electrolytic solution decreases with dilution whereas equivalent conductivity, molar conductivity increases with dilution.
Explanation (E): On dilution, the ionic mobility and number of ions present in solution increases but number of ions per mL decreases.