electrochemistry

Question: Which of the following are concentration cells

1) $Pt,\,{{H}_{2}}\underset{{{p}_{1}}}{\mathop{(g)}}\,|\underset{(m)}{\mathop{HCl}}\,|\underset{{{p}_{2}}}{\mathop{{{H}_{2}}}}\,(g),\,Pt$

2) $Cd,\,(\underset{{{a}_{1}}}{\mathop{Hg}}\,)|\underset{(m)}{\mathop{C{{d}^{2+}}}}\,|(\underset{{{a}_{2}}}{\mathop{Hg}}\,),\,Cd$

3) $Zn\,(s)|{{\underset{{{m}_{1}}}{\mathop{Zn}}\,}^{2+}}||\underset{{{m}_{2}}}{\mathop{C{{u}^{2+}}}}\,|Cu$

4) $Ag\,(s),\,AgCl\,(s)|\underset{m}{\mathop{HCl}}\,||\underset{m}{\mathop{HCl}}\,|AgCl\,(s),\,Ag\,(s)$

Solution:

Explanation: No Explanation

Electrochemical cells

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