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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?

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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

2 FeO + H_{2} O \to {Fe}_{2} O_{3} + 2 H^{+} + 2 e^{-} 2 mol 2 mol or 2 F (oxidation reaction)

Charge on Fe in compound FeO = + 2

Charge on Fe in compound Fe₂O₃= + 3

Change in charge n = 1

Electricity required = nF

= 96487 Coulombs

= 9.65 × 10⁴Coulombs

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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

139. How much electricity is required in coulomb for the oxidation of1 mol of FeO to Fe2O3

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