Which of the following statements are correct | vedclass

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(C) $1$. Fuel cells,such as the $H_2-O_2$ fuel cell,were used in the Apollo space program,making statement $A$ correct.$2$. Fuel cells are highly effi

Vedclass · Accepted Answer

$A, B, D, E$ only

Vedclass · Answer

(C) $1$. Fuel cells,such as the $H_2-O_2$ fuel cell,were used in the Apollo space program,making statement $A$ correct.$2$. Fuel cells are highly efficient,typically converting $60 \%$ to $70 \%$ of the energy of fuels into electricity,unlike thermal plants which are limited by Carnot efficiency. Statement $B$ is generally considered correct in the context of high efficiency,though $40 \%$ is a lower bound.$3$. Fuel cells typically use catalysts like finely divided platinum or palladium,not aluminium. Statement $C$ is incorrect.$4$. The only byproduct of the $H_2-O_2$ fuel cell is water,making it eco-friendly. Statement $D$ is correct.$5$. $A$ fuel cell is a device that converts chemical energy directly into electrical energy,which is the definition of a galvanic cell. Statement $E$ is correct.Therefore,statements $A, B, D,$ and $E$ are correct.

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