Redox Reactions And Electrochemistry Ques 96

Question: 4.5g of aluminium (at mass 27amu) is deposited at cathode from Al3+ 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 H2 4.5273= eq of H2 ;

4.59= eq of H2 2H++2eH2 eq. of H2 = Number of moles × n factor 0.5=,nH2×2

VH2=0.52×22.4 ; VH2=5.6 L



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