KCET2012ChemistryElectrochemistry
Which one of the following has a potential more than zero?
Options
- APt, 1 2 H ₂(1 ~atm ) HCl (2 M )
- BPt , 1 2 H ₂(1 ~atm ) HCl (0.1 M )
- CPt , 1 2 H ₂ (1 atm) HCl (0.5 M )
- DPt, 1 2 H ₂ (1 atm) HCl (1 M)
Correct answer
A. Pt, 1 2 H ₂(1 ~atm ) HCl (2 M )
Step-by-step solution
For Pt, 1 2 H ₂(1 ~atm ) HCl ( x ) According to Nernst equation, electrode potential is given by E _ cell = 0.0591 2 x (a) For Pt, 1 2 H ₂(1 ~atm ) HCl (2 M ) aligned E cell _ cell &= 0.0591 2 2 &= 0.0591 2 0.3010=0.0089 aligned (b) For Pt, 1 2 H ₂(1 atm ) HCl (0.1) M aligned E _ cell &= 0.0591 2 (0.1) &= 0.0591 2 (-1)=-0.0295 aligned (c) For Pt, 1 2 H ₂(1 ~atm ) HCl (0.5 M ) aligned E _ cell &= 0.0591 2 (0.5) &= 0.0591 2 (-0.3010) &=-0.0089 aligned (d) For Pt , 1 2 H ₂ (1 atm) HCl (1 M) F _ cell = 0.0591 2 1=0 Hen