SATHEE: Redox Reactions And Electrochemistry Ques 127

Redox Reactions And Electrochemistry Ques 127

Question: The standard oxidation potential of zinc and silver in water at $298 K$ are $Z n (s) \to Z n^{2 +} + 2 e^{-},;, E = 0.76, V$ $A g (s) \to, A g^{2 +} + 2 e^{-},;, E = - 0.80, V$ Which of the following reactions actually take place [NCERT 1983, 84; KCET 2003]

Options:

A) $Z n (s) + 2 A g^{+} (a q), \to, Z n^{+ +} (a q) + 2 A g (s)$

B) $Z n^{+ +} (a q) + 2 A g (s), \to, 2 A g^{+} (a q) + Z n (s)$

C) $Z n (s) + A g (s), \to, Z n^{+ +} (a q) + A g^{+} (a q)$

D) $Z n^{+ +} (a q) + A g^{+} (a q), \to, Z n (s) + A g (s)$

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Answer:

Correct Answer: A

Solution:

$\overset{o}{Z n_{(s)}}, + 2 A g_{(a q)}^{+} \to Z n_{(a q)}^{2 +} + \overset{o}{2 A g_{(s)}},$ In this reaction zinc act as a anode and $A g$ act as a cathode.

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Redox Reactions And Electrochemistry Ques 127

Question: The standard oxidation potential of zinc and silver in water at 298K are Zn(s)→Zn2++2e−,;,E=0.76,V Ag(s)→,Ag2++2e−,;,E=−0.80,V Which of the following reactions actually take place [NCERT 1983, 84; KCET 2003]

Options:

Answer:

Solution:

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Question: The standard oxidation potential of zinc and silver in water at $298 K$ are $Z n (s) \to Z n^{2 +} + 2 e^{-},;, E = 0.76, V$ $A g (s) \to, A g^{2 +} + 2 e^{-},;, E = - 0.80, V$ Which of the following reactions actually take place [NCERT 1983, 84; KCET 2003]