Draw labelled diagram of H\(_2\) – O\(_2\) fuel cell. Write two applications of fuel cell.
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Solution and Explanation
Applications:
1. Power generation in spacecraft (e.g., Apollo missions).
2. Electric vehicle power sources for clean energy.
Top Questions on Electrochemistry
The molar conductance of an infinitely dilute solution of ammonium chloride was found to be 185 S cm$^{-1}$ mol$^{-1}$ and the ionic conductance of hydroxyl and chloride ions are 170 and 70 S cm$^{-1}$ mol$^{-1}$, respectively. If molar conductance of 0.02 M solution of ammonium hydroxide is 85.5 S cm$^{-1}$ mol$^{-1}$, its degree of dissociation is given by x $\times$ 10$^{-1}$. The value of x is ______. (Nearest integer)
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Consider the following half cell reaction $ \text{Cr}_2\text{O}_7^{2-} (\text{aq}) + 6\text{e}^- + 14\text{H}^+ (\text{aq}) \longrightarrow 2\text{Cr}^{3+} (\text{aq}) + 7\text{H}_2\text{O}(1) $
The reaction was conducted with the ratio of $\frac{[\text{Cr}^{3+}]^2}{[\text{Cr}_2\text{O}_7^{2-}]} = 10^{-6}$
The pH value at which the EMF of the half cell will become zero is ____ (nearest integer value)
[Given : standard half cell reduction potential $\text{E}^\circ_{\text{Cr}_2\text{O}_7^{2-}, \text{H}^+/\text{Cr}^{3+}} = 1.33\text{V}, \quad \frac{2.303\text{RT}}{\text{F}} = 0.059\text{V}$- JEE Main - 2025
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Concentration of KCl solution (mol/L) Conductivity at 298.15 K (S cm-1) Molar Conductivity at 298.15 K (S cm2 mol-1) 1.000 0.1113 111.3 0.100 0.0129 129.0 0.010 0.00141 141.0 - CBSE CLASS XII - 2025
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Imagine, Shubham has to leave for his native place due to emergency work. He and his friend Mahesh had planned to watch a movie at 8.30 pm. Shubham tried to call Mahesh several times but due to connectivity issues he is unable to contact him. Draft a virtual message in about 50/100 words to Mahesh to convey this information. Support your message by giving appropriate reasons.- Maharashtra Class XII - 2025
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