When the following oxidation-reduction reaction in basic solution is balanced, w

Question

When the following oxidation-reduction reaction in basic solution is balanced, what is the lowest whole-number coefficient for OH^-, and on which side of the balanced equation should it appear? Cr_2O_3(s) rightarrow Cr(OH)_2(aq) + CrO^2-_4(aq) A) 2, product side B) 2, reactant side C) 4, product side D) 4, reactant side E) 10, product side. A strip of iron is placed in a 1 M solution of iron(II) sulfate, and a strip of copper is placed in a 1 M solution of copper(II) chloride. The two solutions are connected with a salt bridge, and the two metals are connected to a voltmeter. With the two electrodes connected together, how do the Cl^- ions move? Reduction Half Reaction E degree (V) Fe^2+(aq) + 2e^- rightarrow Fe(s) -0.41 Cu^2+(aq) + 2e^- rightarrow Cu(s) 0.34 A) through the external circuit from Cu to Fe B) through the salt bridge from the Cu half-cell to the Fe half-cell C) in random fashion D) in the direction opposite to the movement of the sulfate ions E) together with the Cu^2+ ions to form an insoluble precipitate. A lead storage battery involves the following two half-reactions: PbSO_4(s) + 2e^- rightarrow + SO^2-_4(aq); E degree = - 0.36 V PbO_2(s) + 4H^+(aq) + SO^2-_4(aq) rightarrow PbSO_4(s) + 2H_2O(l); E degree = 1.69 V During the discharge reaction of the lead storage battery at 1.0M concentrations, the cell potential and the reducing agent are, respectively, A) -2.05 V and Pb. B) -2.05 V and PbO_2. C) 2.05 V and Pb. D) 2.05 V and PbO_2. E) 1.33 V and Pb.

Explanation / Answer

Answer: B) 2, Reactant side

Explaination:

2Cr2O3 + 2OH- + 2H2O CrO42- + 3Cr(OH)2

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