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Earn 100

Assertion: If SRPof substance is -0.5V then reduction of substance is possible only in basic medium.

Reason: SRP of water is -0.8274V and at reduction potential is zero at pH=7

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Important Questions on Electrochemistry

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The chemical reaction,

2AgCl(s)+H2(g)2HCl(aq)+2Ag(s)

taking place in a galvanic cell is represented by the notation:

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For the reduction of silver ions with copper metal, the standard cell potential was found to be +0.46V at 25°C. The value of standard Gibbs energy, ΔG0 will be F=96500 C mol-1
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The products formed when an aqueous solution of NaBr is electrolysed in a cell having inert electrodes are:

 

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A current of 96.5A is passed for 18 min between nickel electrodes in 500mL solution of 2MNiNO32 The molarity of solution after electrolysis would be:
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Assertion: According to Kohlrausch law the molar conductivity of a strong electrolyte at infinite dilution is the sum of molar conductivities of its ions.

Reason: The current carried by cation and anion is always equal.

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The reduction potential at pH=14 for the Cu2+/Cu  couples is

 (Given Ec˙2+/Cu0=0.34V;KspCu(OH)2=1×10-19:

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The minimum voltage required to electroyse alumina in the Hall-Heroult process is:

 (Given, ΔGf0Al2O3=-1520 kJ mol-1;ΔGf0CO2=-394 kJ mol-1

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The pH of 0.5L of 1.0MNaCl after the electrolysis for 965s using 5.0A current, is: