Redox Reactions And Electrochemistry Question 746
Question: 4.5g of aluminium (at mass 27amu) is deposited at cathode from $ A{l^{3+}} $ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from $ {H^{+}} $ ions in solution by the same quantity of electric charge will be [CBSE PMT 2005]
Options:
A) 22.4 L
B) 44.8 L
C) 5.6 L
D) 11.2 L
Show Answer
Answer:
Correct Answer: C
Solution:
Eq of $ Al $ = eq of $ H_2 $ $ \frac{4.5}{\frac{27}{3}}= $ eq of $ H_2 $ ;
$ \frac{4.5}{9}= $ eq of $ H_2 $ $ 2{H^{+}}+2{e^{-}}\to H_2 $ eq. of $ H_2 $ = Number of moles × n factor $ 0.5=,{n_{H_2}}\times 2 $
$ {V_{H_2}}=\frac{0.5}{2}\times 22.4 $ ; $ {V_{H_2}}=5.6\ L $
BETA
