electrochemistry, need asap shown above. The standard reduction potentials for t

Question

electrochemistry, need asap

shown above. The standard reduction potentials for two half reactions are h of the statements listed below wil be true tor the following reacton taking place under standard conditions? AN Ora- ANP- Cr a. E 2.40 V and the reaction is not spontaneous b- E 0.92 Vand the is spontaneous c. Es -0.92 V and the reaction is not spontaneous d. E -0.g2 v and the reaction is spontaneous e. Es 2.40 V and the reaction is not spontaneous 5. Which of the following is true of the redox reaction that takes place in a galvanic cell under standard conditions? a. Go and Ea are positive and K is greater than 1 b. Go is negative, E is positive, and K is greater than 1 c, G is positive, Eo is negative, and K is less than 1 d. Go and Es are negative and K is greater than 1 e. Go and Ea are negative and K is less than 1

Explanation / Answer

q4) Al + Cr+3 -----------> Al+3 + Cr

So emf of the cell = srp pf Cr - srp pf Al

= -0.76-(-1.76)

= +0.92V

As the emf is positive the reaction is spontaneous

OPtion B

Q5)In the Galvanic cell , Zn + Cu+2 ---------> Cu + Zn+2

the emf of the cell is postive (sponstaneous ) K eq >1 and delta G is negative.

Option B

Q1) As concentration of electrolyte increases the oxidation potential decreases and reduction potential increases according to Nernst equation.

for Cd + Cu+2 ------> Cd+2 + Cu

Ecell = E0 - (0.059/n) log [Cd+2]/{cU+2]

Thus as [Cd+2}] increases the E cell decreases and as Cu+2 increases Ecell increases.

Q2) The best oxidising agent among the given ions is the ion with lowest reduction potential, tha tis Co+2 .

Lowest SRP means more tendency for reduction , more tendency to accept electrons compared to the ones with more negative SRP.

Q9) decreases

Q10) increases

Q7)option B Zn can replace Mn+2 which has less negative potential form solution.

Q8) Al

Al has more negative SRP than Zn , that is it has more tendency to undergo oxidation, thus reduce the others.

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