QUESTION 9 Consider the following electrode potentials: Mg2+ + 2e- Mg 7V =-1.19

Question

QUESTION 9 Consider the following electrode potentials: Mg2+ + 2e- Mg 7V =-1.19 V 0.16 V ++e-Cu Which one of the reactions below will proceed spontaneously from left to right? B. Mg2+ + 2Cu+ 2Cu2+ + Mg () D, V + 2Cu2+-+ V2+ + 2 E. none of these QUESTION 10 Which of the following is true for the cell shown here? Zn(s) I Zn2+(ag) Cr3t (ac) 1 Crs) A. The electrons flow from the cathode to the anode. e B. The zinc is reduced O C. The electrons flow from the zinc to the chromium. e D. The electrons flow from the chromium to the zinc. E. The chromium is oxidized.

Explanation / Answer

Question5

Answer

D) V + 2Cu2+ -------> V2+ + 2Cu+

Explanation

at anode

V(s) --------> V2+(aq) + 2e E°red = -1.19V

at Cathode

2Cu2+(aq) + 2e -------> 2Cu+(aq) E°red = 0.16V

E°cell = E°red,cathod - E°red,anode

= 0.16V - (-1.19V)

= 1.35V

E°cell is positive , so reaction D is spantaneousl proceed from left to right

Quention6

Answer

C) The electrons flow from the Zinc to the Chromium

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