15,16 please show how you came to your answer hode esalt bridgsD negative elecod

Question

15,16
please show how you came to your answer

hode esalt bridgsD negative elecodeEv 15. A voltaic cell is represented as Znisszn (.0 MCu( M)xCuks) Which of the oshonwing s FALSE? A. The mass of the zinc electrode increases daring discharge. B. The copper electrode is the cathode C. Electrons flow through the external eircuit from the zinc clectrode to the copper electrode D. Reduction occurs at the copper electrode during discharge. E. The concentration of Cu decreases during discharge. 16. The following two half reactions are involved in a galvanic cell. At standard conditions, what specics are producod at each electrode? A Ag is produced at the cathode and Ni at the anode. B. Ag is produced at the cathode and Ni at the anode. C. Ag' is produced at the snode and Ni at the cathode D. Ag is produced at the anode and Ni al the cathode. E. noee of these is correet 17. What is the cell reaction for the voltaic cell: Cr(s)jCr(aCl agC(aq)Pt?

Explanation / Answer

Solution :-

Q15) Zn metal is more reactive than the Cu metal so the Zn itself undergoes oxidation and reduces the Cu^2+

So the Zn acts as anode and copper acts as cathode

At the cathode reduction takes place and at anode oxidation takes place

So the mass of Zinc electrode decreases because it gets used up in the process and mass of copper electrode increases.

So the option A is the false statement. So the answer is option A.

Q16) For the Ag and Ni cell

Reduction potential of the Ni is lowest so the Ni itself undergoes oxidation and reduces the Ag+

So the Ni is oxidized at anode and Ag^+ is reduced at cathode

So the correct statement is option B that is

Ag is produced at cathode and Ni^2+   at the anode.

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