12) If the Ecell value of galvanic cell below is 1.50 V. What should be the concentration or ragi? Wnat should be the concentration of [Ag']? Zn(s)vert Zn^+2(0.018M)Vert Ag'(ldots M)vert Ag(s). (E^0Zn^+1/z_(n)^m-0.763V;E^circ Ag'/Ag=0.799V) A) 0.009 M B) 0.012 M C) 0.016 M D) 0.024 M E) 0.083 M 13) Which of the following statement(s) is/ are correct? I- Oxidizing agent is an agent that causes another species to be oxidized, but itself is reduced. II- During the reduction molecules loss oxygen atom. III- In a galvanic cell spontaneous chemical reaction generate electrical energy. A) Only I B) Only III C) I and III D) II and III E) I, II and III 14) Which of the following statement(s) is/ are correct for the reaction below. Pt,H_(2)(580 torr)vert HCl(0.0016M)Vert Pd^2(0.28 M)vert Pd(s) ( E^circ Pd^n/Pd=0.987V)(760torr:1atm) 1. The reaction type is spontancous II. Ecell=0.809V III. Keq=2.19times 10^33 A) Only I B) I and II C) Iand III D) II and III E) I,II and III 15) Which of the following(s) may cause an instrumental deviations in Beer's law? 1. Polychromatic light source II- Stray light III- Cell/Cuvette variability A) Only II B) Only III C) I and II D) II and III E) I, II and III

12) To find the concentration of [Ag+], we can use the Nernst equation:<br /><br />$E_{cell} = E^0_{cell} - \frac{0.0592}{n} \log Q$<br /><br />where $E^0_{cell}$ is the standard cell potential, n is the number of moles of electrons transferred, and Q is the reaction quotient.<br /><br />In this case, $E^0_{cell} = E^0_{Ag/Ag+} - E^0_{Zn/Zn2+} = 0.799V - (-0.763V) = 1.562V$<br /><br />The reaction quotient Q is given by $Q = \frac{[Ag+]}{[Zn2+]}$<br /><br />Substituting the given values, we have:<br /><br />$1.50V = 1.562V - \frac{0.0592}{2} \log \frac{[Ag+]}{0.018M}$<br /><br />Solving for [Ag+], we get:<br /><br />$[Ag+] = 0.012M$<br /><br />Therefore, the correct answer is B) 0.012 M.<br /><br />13) The correct statements are:<br />I- Oxidizing agent is an agent that causes another species to be oxidized, but itself is reduced.<br />III- In a galvanic cell, spontaneous chemical reaction generates electrical energy.<br /><br />Therefore, the correct answer is C) I and III.<br /><br />14) The correct statements are:<br />I. The reaction type is spontaneous.<br />II. $E_{cell} = 0.809V$<br />III. $K_{eq} = 2.19 \times 10^{33}$<br /><br />Therefore, the correct answer is E) I, II and III.<br /><br />15) The factors that may cause instrumental deviations in Beer's law are:<br />II. Stray light<br />III. Cell/Cuvette variability<br /><br />Therefore, the correct answer is D) II and III.