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

Which of the following changes will cause the free energy of a cell reaction to decrease ?
`Zn|ZnSO_(4)(aq)(x_(1)M)||HCl(aq)(x_(2)M)|H_(2)(g),Pt`.

A

Increase in the volume of `HCl` solution from `100mL` to` 200mL`

B

Increase in the pressure of hydrogen from `1 atm ` to `2 atm`

C

Increase in molarity `x_(2)` from `0.1 ` to `1M`

D

Increase in molarity `x_(1)` from `1M` to `0.1M`.

Text Solution

Verified by Experts

The correct Answer is:
c,d
`Zn|Zn^(2+)(x_(1)M)||H^(o+))|H_(2)(g),Pt`
Free energy to decrease `implies` cell is more spontaneous `(E_(cell)uarr)`
`Zn+2H^(o+)(x_(2)M) rarr Zn^(2+)(x_(1)M)+H_(2(g))`
`implies E_(cell)=E^(c-)._(cell)-(0.059)/(2) log .([Zn^(2+)]p_(H_(2)))/([H^(o+)]^(2))`
`DeltaG=-ve or E_(cell)=+ve`
`c.` When `x_(2)(0.1M)` changed to `1M`.
`d.` When `x_(1)(1M)` changed to `0.1M`.
Promotional Banner

Similar Questions

Explore conceptually related problems

Which of the following reactions occurs at anode in the electrochemical cell reaction ? Zn(s)+Cu^(2+)(aq)toZn^(2+)(aq)+Cu(s)

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

The e.m.f. of the following cell containing two hydrogen electrodes is : Pt, 1//2H_(2)(g)"|"H^(+)(10^(-8)M)."||"M^(+)(0.001M)"|"1//2H_(2)(g), Pt

Which one of the following condition will increase the voltage of the cell represented by the equation : Cu_((s))+2Ag_((aq))^(+)hArr Cu_((aq))^(+)+2Ag_((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?