1 Marks Question

Question 11 Mark

The cell in which the following reaction occurs: $Fe_{(aq)}^{3+} + 2I_{(aq)}^{-} \longrightarrow 2Fe_{(aq)}^{2+} + I_{2(s)}$ has $E_{cell}^{0} = 0.236 V$ at 298 K. Calculate the standard Gibbs energy of the cell reaction. (Given: $1 F = 96500 C mol^{-1}$)

Answer

$\Delta G^{0} = -nFE_{cell}^{0}$
$= -1 \times 96500 \times 0.236$
$= -22.774 kJ$

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Question 21 Mark

What is the effect of dilution on molar conductance?

Answer

Effect of dilution on molar Conductance: When a solution is diluted, ions are more Far away from each other and mobility of ions increases which leads to increase in molar conductivity of the solution.

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Question 31 Mark

What do you understand by secondary cell?

Answer

Those cells in which reactions can be reversed by an external electrical energy source are called secondary cell.
These are also called storage cell.
Examples: Lead storage battery and nickel-cadmium battery.

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Question 41 Mark

What is Equivalent Conductance?

Answer

Equivalent Conductance: The conductance of a solution containing one gram equivalent of electrolyte is called equivalent conductance,
$\Lambda = \frac{1000 \times \kappa}{N}$

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Question 51 Mark

Define electrochemical equivalent.

Answer

The amount of a substance deposited when a current of one ampere is passed through it for a second is called electro-chemical equivalent.

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Question 61 Mark

Define corrosion. What is the chemical formula of rust?

Answer

Corrosion: The process of slow deterioration of a metal by the gases and water vapours present in air is called corrosion.
The chemical formula of rust is $Fe_{2}O_{3} \cdot xH_{2}O$.

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Question 71 Mark

What is the function of salt bridge in an electrochemical cell?

Answer

It is used to connect the anode and cathode in a galvanic cell during the process of electrolysis.

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Question 81 Mark

What is Molar Conductance?

Answer

Molar Conductance: It is the conductance of a solution containing 1 mole of the electrolyte i.e. $\Lambda_{m} = k \times m$.
where V is the volume of solution and k is specific conductance.

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