solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from 
ions in solution by the same quantity of electric charge will be: [AIPMT (S) 2005]
A) 22.4 L
B) 44.8 L
C) 5.6 L
D) 11.2 L
Correct Answer: C
Solution :
| [c] From second law of Faraday |
| \[\frac{{{m}_{Al}}}{{{m}_{H}}}=\frac{{{E}_{Al}}}{{{E}_{H}}}\] |
| \[\therefore \frac{4.5}{{{m}_{H}}}=\frac{27/3}{1}\] |
| \[or{{m}_{H}}=0.5\,g\] |
| \[\because \,2\,g\,{{H}_{2}}\,volume\,at\,STP=22.4\,L\] |
| \[\therefore \,\,0.5\,g\,{{H}_{2}}\,volume\,\,at\,STP\] |
| \[=\frac{22.4\times 0.5}{2}\,L=5.6\,L\] |
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