A fuel cell isA. the voltaic cells in which discontinuous supply of fuels are send at anode to give oxidationB. the voltaic cell in which fuels such as : `CH_(4) , H_(2) , CO` are used up at anodeC. it involves the reactions of `H_(2) - O_(2)` fuel cell such as Cathode : `2 H_(2) + 4OH^(-) to 4 H_(2) O(l) + 4e` Anode : `O_(2) + 2 H_(2)O (l) + 4e to 4 OH^(-)`D. the efficiency of a `H_(2) - O_(2)` fuel cell is very low

A fuel cell isA. the voltaic cells in which discontinuous supply of fu

1.	A fuel cell isA. the voltaic cells in which discontinuous supply of fuels are send at anode to give oxidationB. the voltaic cell in which fuels such as : `CH_(4) , H_(2) , CO` are used up at anodeC. it involves the reactions of `H_(2) - O_(2)` fuel cell such as Cathode : `2 H_(2) + 4OH^(-) to 4 H_(2) O(l) + 4e` Anode : `O_(2) + 2 H_(2)O (l) + 4e to 4 OH^(-)`D. the efficiency of a `H_(2) - O_(2)` fuel cell is very low
Answer» Correct Answer - B `CH_(4) , H_(2) , CO` are used fuel .

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Define molar conductivity of a solution and explain how molar conductivity changes with change in concentration of a solution for a weak and a strong electrolyte.
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Based on the data given below, the correcy order of reducing power is: `Fe_((aq.))^(3+) + e rarr Fe_((aq.))^(2+), E^(@) = +0.77 V` `Al_((aq.))^(3+) + 3e rarr Al_((s)), E^(@) = -1.66 V` `Br_(2(aq.)) + 2e rarr 2Br_((aq.))^(-), E^(@) = +1.08 V`A. `Br^(-) lt Fe^(2+) lt Al`B. `Fe^(2+) lt Al lt Br^-`C. `Al lt Br^(-) lt Fe^(2+)`D. `Al lt Fe^(2+) lt Br^(-)`
What are elementary reactions ?

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