Please offer explanation as well Which of the following reactions cannot be used

Question

Please offer explanation as well

Which of the following reactions cannot be used to build an electrochemical cell? Cu2+(aq) + Zn(s) rightarrow Zn2+(aq) + Cu(s) S042-(aq) + Ba2+(aq) rightarrow BaS04(s) 2H2(q) + 02(g) rightarrow 2H20(I) 2 NaCl(I) rightarrow 2 Na(I) + Cl2(g) What is the shorthand notation for a galvanic cell that uses the reaction Ni (s) + Cu2+ (aq) rightarrow Ni2+ (aq) + Cu (s) Which of the following is the correct shorthand notation for the cell reaction: Zn(s) + 2H+ (aq) rightarrow Zn2+ (aqP) + H2 (g).

Explanation / Answer

For battery to operate there must be a redox reaction, reduction and oxidation at the same time.

so, ans 1) is A, ans 2) is B and ans 3) is D

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