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Electrochemistry

Short Answer Type

131. Write the cell reactions which occur in lead storage battery (i) when the battery is in use and (ii) when the battery is on charging.

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132. The conductivity of 0.20 M solution of KCl at 298 K is 0.0248 s cm^–1. Calculate its molar conductivity.

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133.

How much charge is required for the following reductions:
1 mol of Al³⁺ to Al?

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134.

How much charge is required for the following reductions:
1 mol of Cu²⁺ to Cu?

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135.

How much charge is required for the following reductions:
1 mol of MnO₄^– to Mn²⁺?

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136. How much electricity in terms of Faraday is required to produce
20.0 g of Ca from molten CaCl₂?

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137. How much electricity in terms of Faraday is required to produce
40.0 g of Al from molten Al₂O₃?

{Al}_{2} O_{3} ⇋ 2 {Al}^{3 +} + 3 {O_{2}}^{-}

{Al}^{3 +} + 3 e^{-} \to Al 3 mol 1 mol (= 27 g) (reduction of {Al}^{3 +})

Charge on Al in Al₂O₃

2Al + 3O = 0

Oxygen has –2

2Al +3(–2) = 0

Al = 3

Change transfer n = 3

Charge required for 1 mol of Al = 3F

Number of moles of Al = 40 /27 = 1.48

The electricity required to produce 1.48 mol of Al = 1.48 × 3 F

= 4.44 F

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138. How much electricity is required in coulomb for the oxidation of
1 mol of H₂O to O₂ ?

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139. How much electricity is required in coulomb for the oxidation of
1 mol of FeO to Fe₂O₃

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140. A solution of Ni(NO₃)₂ is electrolysed between platinum electrodes using a current of 5 amperes for 20 minutes. What mass of Ni is deposited at the cathode?

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Previous Year Papers

Test Series

Test Yourself

Short Answer Type

137. How much electricity in terms of Faraday is required to produce40.0 g of Al from molten Al2O3?

137. How much electricity in terms of Faraday is required to produce
40.0 g of Al from molten Al₂O₃?