Home
Class 12
CHEMISTRY
Which of the following changes will incr...

Which of the following changes will increase the `EMF` of the cell `:`
`Co(s)|CoCl_(2)(M_(2))||HCl(M_(2))||(H_(2),g)Pt`

A

Increae in the volume of `CoCl_(2)` solution from `100mL` to `200mL`.

B

Increase `M_(2)` from `0.1 M` to `0.50M`.

C

Increase the pressure of the `H_(2)(g)` from `1.0` to `2.0 atm`.

D

Increase `M_(1)` from `0.01M` to `0.50M`.

Text Solution

Verified by Experts

The correct Answer is:
b
`Co+2H^(o+) rarr Co^(2+)+H_(2)`
`Q=([Co^(2+)])/([H^(o+)]^(2))`
`E=E^(c-)-(0.0591)/(2) log .([Co^(2+)])/([H^(o+)]^(2))`
`E` will increase when `[H^(o+)]` increases of `[Co^(2+)]` decreases.
Promotional Banner

Similar Questions

Explore conceptually related problems

Which one of the following will increase the volatage of the cell ? Sn(s) + 2Ag^(+)(aq) rarr Sn^(2+) (aq)+2Ag(s)

Predict in which of the following reactions, entropy increases/decreases 2NaHCO_(3) rarr Na_(2)CO_(3)(s) + CO_(2)(g) + H_(2)O(g)

Calculate the emf of the following cell at 298K, Fe(s)Fe^(2+)(0.001M)||H^+(1M)|H_2(g)(1ba r), Pt(s)

Predict in which of the following reactions, entropy increases/decreases H_(2)(g) rarr 2H(g)

E_(1),E_(2) and E_(3) are the emfs of the following three galvanic cells respectively. (i) Zn_((s))|Zn^(2+)(0.1M)||Cu^(2+)(1M)|Cu_((s)) (ii) Zn_((s))|Zn^(2+)(1M)||Cu^(2+)(1M)|Cu_((s)) (iii) Zn_((s))|Zn^(2+)(1M)||Cu^(2+)(0.1M)|Cu_((s)) Which one of the following is true?

Balance the following chemical equation FeCl_(2)+H_(2)S to FeS+HCl

At constant P and T which of the following statement is correct for, C (s) + O_(2)(g) rarr CO_(2) (g)

Write the Nernst equation and compute the emf of the following cell at 298 K: Sn(s)|Sn^(2+)(0.05M)||H^+(0.02M)|H_2,1atm//Pt