04(P)%20-%20Thermal%20and%20Chemical%20Effects%20of%20Electric%20Current

04(P)%20-%20Thermal%20and%20Chemical%20Effects%20of%20Electric%20Current

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4 - THERMAL AND CHEMICAL EFFECTS OF ELECTRIC CURRENT Page 1 1 ) How much current should be passed through an electrochemical cell to deposit 0.5 gm of gold on cathode in 1 hour. Faraday constant = 96500 coulomb / mole, atomic weight of gold = 197 gm / mole, valency of gold = 3. [ March, 2003 ] ( Ans: 0.2 A ) 2 ) The electrochemical equivalent of silver is 11.18 × 10 - -- 7 kg / coulomb and its atomic mass is 108. The atomic mass of gold is 197 and its valency is 3 Find the electrochemical equivalent of gold. [ October, 1998 ] ( Ans: 6.80 × 10 - -- 7 kg / coulomb ) 3 ) A heater rod is placed in a water tub connected with 230 volt mains. 10 litre of water is to be heated from 20 ° C to 80 ° C temperature within 10 minutes. What would be the value of electric current used ? [ October, 1997 ] ( Ans: 18.3 A ) 4 ) Two electric bulbs having resistances 10 and 20 are connected in series with 24 volt battery. Which bulb will give more light ? [ March, 1997 ] ( Ans: bulb having resistance
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This note was uploaded on 11/28/2011 for the course PHYSICS 300 taught by Professor Smith during the Spring '06 term at ITT Tech Flint.

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04(P)%20-%20Thermal%20and%20Chemical%20Effects%20of%20Electric%20Current

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