IIT JEE , AIEEE Forum - Chemistry , Physical Chemistry - Physical chemistry Questions.Solve it quickly

Anupamagrawal13a

--------------------------------------ELECTROCHEMISTRY------------------------------------------

Question1-

The volume of gases liberated at STP when a charge of 2F is passed through

aqueous soln. of sodium phosphate, is

a)11.2L

2)44.8L

c)33.6L

d)22.4L

Question2-

The rxn occuring at anode when the electrolysis of CuSO4 is done using Pt electrode,is

a)Cu-->Cu2+ + 2e-

b)2SO4(2- charge) + 2H2O-->H2SO4 + O2 + 4e-

c)2H2O-->O2 + 4H+ + 4e-

d)2Cu-->Cu2(2+ charge) + 2e-

Please solve these questions very quickly.

krishna.gopal

One question at a time.
For first question electrolysis of sodium phosphate will give H2 and O2
2H+ + 2e- --> H2
4OH- --> O2 +2H2O +4e-
So 2F(2 mole electrons) charge will generate 1mole H2 and 1/2 mole O2
So total volume of gas at STP= 1.5 mole*22.4 ltr/mole=33.3 ltr

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