61. Assuming the reaction proceeds in the forward direction Zn(s) is thea (A) oxidizing: gains (C) reducing; gains Given the standard reduction potentials at 25°C, which cell reaction is spontaneous? 2Ni\"(aq) + zh(s) ? 2Ni(s) + Zn2+(aq) agent because it_ electrons. (B) oxidizing: loses (D) reducing: loses 62. Half Reaction EO Au (aq) +3eAu(s) Ag (aq) +eAg(s) Ni(ag)+ 2e-Ni(s) 1.42 V 0.79 V 0.23 V (A) Ni(s) + 2Ag+(aq) ? NF+(aq) +2Ag(s) (B) 2Ag(s) + Ni (aq) -2Ag\'(aq) + Ni(s) (C) Au(s)+3Ag\'(aq)Au(a)3Ag(s) (D) 2Au(s) +3Ni2 (aq) 2Au (aq) +3Ni(s) 63. The standard cell potential for the reaction Zn(s) + Cu (aq) -Zn2 (aq)+Cu(s) is +1.10 V. If the molar concentrations of both Cu and Zn2 are changed to 2.0 M, the cell potential will be (A) equal to-1.10 V. (B) equal to +1.10 V. (C) greater than +1.10 V (D) less than +1.10 V but greater than zero. 64. Which statement is correct? (A) When E cell is positive, AG xn is positive. (B) When E cell is positive, AGonnis negative. (C) When E cell is positive, K is less than 1 but greater than O (D) When Ecel is positive, K is less than o.
Solution
1) Oxidation is the removal of electrons or increase in oxidation number and reduction is, decrease in oxidation number or addition of electrons. Oxidizing agent oxidizes other chemical species and gets reduced. Reducing agent reduces other chemical species and gets oxidized. In the reaction, Zn loses electrons and gets oxidized and is a reducing agent. Ni gains electrons and gets reduced and is a reducing agent. Thus the answer is D, Zn is reducing agent because it loses electrons
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61- Assuming the reaction proceeds in the forward direction Zn(s) is t.docx
1. 61. Assuming the reaction proceeds in the forward direction Zn(s) is thea (A) oxidizing: gains
(C) reducing; gains Given the standard reduction potentials at 25°C, which cell reaction is
spontaneous? 2Ni"(aq) + zh(s) ? 2Ni(s) + Zn2+(aq) agent because it_ electrons. (B) oxidizing:
loses (D) reducing: loses 62. Half Reaction EO Au (aq) +3eAu(s) Ag (aq) +eAg(s) Ni(ag)+ 2e-
Ni(s) 1.42 V 0.79 V 0.23 V (A) Ni(s) + 2Ag+(aq) ? NF+(aq) +2Ag(s) (B) 2Ag(s) + Ni (aq) -
2Ag'(aq) + Ni(s) (C) Au(s)+3Ag'(aq)Au(a)3Ag(s) (D) 2Au(s) +3Ni2 (aq) 2Au (aq) +3Ni(s) 63.
The standard cell potential for the reaction Zn(s) + Cu (aq) -Zn2 (aq)+Cu(s) is +1.10 V. If the
molar concentrations of both Cu and Zn2 are changed to 2.0 M, the cell potential will be (A)
equal to-1.10 V. (B) equal to +1.10 V. (C) greater than +1.10 V (D) less than +1.10 V but greater
than zero. 64. Which statement is correct? (A) When E cell is positive, AG xn is positive. (B)
When E cell is positive, AGonnis negative. (C) When E cell is positive, K is less than 1 but
greater than O (D) When Ecel is positive, K is less than o.
Solution
1) Oxidation is the removal of electrons or increase in oxidation number and reduction is,
decrease in oxidation number or addition of electrons. Oxidizing agent oxidizes other chemical
species and gets reduced. Reducing agent reduces other chemical species and gets oxidized. In
the reaction, Zn loses electrons and gets oxidized and is a reducing agent. Ni gains electrons and
gets reduced and is a reducing agent. Thus the answer is D, Zn is reducing agent because it loses
electrons
