In which case would the least number of faradays of electricity be required for

Question

In which case would the least number of faradays of electricity be required for the liberation of 1.0 g of free metal? (A) K from molten KOH (B) Na from molten NaCl (C) Cu from aqueous CuSO_4 (D) Ag from aqueous AgNO_3 A vanadium electrode is oxidized electrically. If the mass of the electrode decreases by 114 mg during the passage of 650 coulombs, what is the oxidation state of the vanadium product? (A) +1 (B) +2 (C) +3 () +4 A current of 5.00 A is passed through an aqueous solution of chromium(III) nitrate for 30.0 min. How many grams of chromium metal will be deposited at the cathode? (A) 0.027 g (B) 1.62 g (C) 4.85 g (D) 6.33 g What mass of platinum could be plated on an electrode from the electrolysis of a Pt(NO_3)_2 solution with a current of 0.500 A for 55.0 s?

Explanation / Answer

27)

Ag is maximum molar mass

So, number of mol of Ag will be least

Number of Faraday used = number of mol * charge

Since charge is also 1 here , this will require minimum Faraday

Answer: D) Ag from aqueous AgNO3

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