1. When the reaction below proceeds in the forward direction, which ONE statemen
ID: 1043420 • Letter: 1
Question
1. When the reaction below proceeds in the forward direction, which ONE statement is true? Fe (ag)+Cofs) Fe (oq)+Co2(aq) A) Fe (aq) is oxidized and Co(s) is reduced. B) Fe (aq) is oxidized and Co (aq) is reduced. C) Co(s) is oxidized and Fe (aq) is reduced. D) Co(s) is oxidized and Co?(aq) is reduced E) Fe (aq) is oxidized and Co(s) is reduced. 2. Which is the balanced reduction half-reaction for the reaction below? D)Cols)is oxidized and ndCaq"( B) Cu(aq)Cu(s) D) Cu(s)Cu(aq)2e A) NOs(aq)+4 H (aq) NO(g)+ 2 H2O C) NO, (aq)+4 H(aq)NO(g) + 2 H,010 E) NOs (aq)+4 H(aq)NO(g)+ 2 H:014+2 e 3. According to the following cell notation, which species is undergoing reduction? D) Mno2(s) A) Mn2(aq) 4. The electrochemical reaction which powers a lead-acid storage battery is: Pb(s) + Pbo-(s)+4H'(aq)+2SO (aq) 2PbSOa(s) + 2H0U) A single cell of this battery consists of a Pb electrode and a Pb02 electrode, each submerged in sulfuric acid. What reaction occurs at the cathode during discharge? A) Pb(s) is reduced to PbSOs(s). B) PbO:(s) is reduced to PbSO.(s). C) PbO2(s) is oxidized to PbSOa(s). D) Pb(s) is oxidized to PbsO(s). E) H is oxidized to H,0(0 B) Sn(ag) C) Sn(s) E) Pt(s) 5. A dry cell reaction is- Zn(s) 2 Mnoa(s) + HOUZn(OH)2(s) + Mn2Os(s) Which of the following statements concerning this cell is/are correct? 1. MnO2(s) is oxidized to Mn,Os(s) during cell discharge. 2. Water is consumed during the discharge of this cell. 3. Zn(OH)2(s) forms at the anode during discharge of this cell. A) 1 only B) 2only C) 3 onlyD) 2 and 3 E) 1, 2 and 3 6. Which ONE of the following statements is true for a voltaic (galvanic) cell? A) Electron flow is from the anode to the cathode. 8) Electron flow is through the salt bridge. C) Electron flow is from the positive electrode to the negative electrode. D) Electron flow is from the cathode to the anode. E) Electron flow is from the oxidizing agent to the reducing agent through an external circuit. 7. Given: Mn2(aq)+ 2eMn(s); E1.18 V Cu2(ag)+2e Cu(s); E 0.34 V Cr20, (aq)+14H (aq)+6e2Cr (aq)+7H2O(: E 1.33 V Which of the following species is the strongest reducing agent? A) B) Cu D) Mn2 E) Cr20,2- MnExplanation / Answer
1) In the reaction, Fe3+ + e- --> Fe2+ and Co --> Co2+ + 2e-
Due to the loss of electron, Co is oxidised and due to the gain of electron Fe3+ is reduced. Therefore, C is the correct answer.
2) In a redox reaction oxidation state is balanced first by adding electrons, then charge is balanced by adding H+ and then number of O and H are balance by adding H2O. So C is the correct answer.
3) According to the cell notation MnO2 is undergoing reduction to Mn2+. Hence correct answer is D.
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