following voltaic cell is 0240 V solutice 66. The cell potential for the at 25 \

Question

following voltaic cell is 0240 V solutice 66. The cell potential for the at 25 "C. If the standard cell potential() what is the concentration of the cadmium ion galvanic cell in Which statement is true regarding the which an electric current is being produced 62. Nisodaq)-Cd(s)-Ni(s) + CdSOdaq) Cu2+ + 2e- Cu E.+034 V Salt Salt Bridge Ni Zn ? M Caso 1.0M NisO (B) 1.0M (A) 2.0M (C) 0.066M (A) Copper ions are produced at the copper electrode. (B) Zine ions are produced at the copper electrode. (C) The mass of the copper electrode is increasing. (D) Oxidation occurs at the copper electrode. (D) 0.0043 M One of the recently named elements is element 117- Tennessine. Identify the missing particle in the nuclear reaction that produces this element 67. 63. Iron (Fe) can be prevented from rusting by coating it with a metal that rusts (oxidizes) more easily. Which metal listed below would be the best choice for coating an iron nail? Cu"(aq) + 2e- Cu(s) Fe2+(aq) + 2e. Fe(s) APTaq) + 3e- Al(s) +0.34 V -0.45 V -1.66 V You have a sample that contains the same number of atoms of the two radioactive isotopes of Neon; "Ne and Ne. At some time in the future you find that the sample contains more Neon-24 than Neon-23. Which statement about the half lives of these isotopes is true? 68. (A) A (B) Cu (C) AP (D) Cu 64. Given the standard reduction potential for Cd and Ni (A) The half life of Neon-24 is shorter than the half life (B) The half life of Neon-24 is longer than the half life (C) Because these are both neon isotopes, the half lives (D) All nuclear processes have the same half life. Cd2+(aq) + 2e. Cd(s) NF"(aq)+2e- Ni(s) -0.40 V -025 V of Neon-23 Which pair of substances will react spontaneously? (A) Ni and Cd (C) NP"and Cd of Neon-23. (B) Ni and Cd (D) Ni and Cd are equal. 65. Consider the equilibrium What would be an acceptable measurement to make with the buret shown? 69. Under standard conditions at 25 °C, what is Ke for this equilibrium? (A) 4.0x105 (C) 3.9x101 - 30 (B) 1.6×10-7 (D) 6.4x10- 31 (A) 30.3 ml (C) 30.33 ml (B) 31.7 mL (D) 31.67 mL

Explanation / Answer

62)

The one with greater Eo value will be reduced

So, Cu is reduced here

So, Cu2+ will change to Cu.

reduction occurs at copper and mass of copper will be increasing

And Zn will change to Zn2+

Answer: C

63)

Iron shouldn’t be oxidised

SO, it should be reduced and other elements should be oxidised

So, Eo of other metal should be less than iron for this

This is true for Al

Answer: A

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