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a
ZnCl2
b
CuSO4
c
HgCl2
d
Hg2Cl2
answer is D.
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Detailed Solution
Primary reference electrode is SHESecondary reference electrode is 1) Calomel electrode 2) Quinhydrone electrode.Calomel electrode is an aq.phase in contact with Hg and Hg2Cl2 in a saturated solution of KCl in water.Cell notation Cl(1M)-/Hg2Cl2(s)/Hg(l)/Pt(s)