Match the following

Answer

A, B, C, D

Explanation

A) `underset((l))(Hg)// Hg_2 underset((s))(Cl_2)//underset((aq))(KCl)` calomel electrode ( reference electrode )
when culomel electrode in volves oxidation `underset((l))(2Hg) to underset((aq))(Hg_2^(2+)) + 2e^(-)`
when culomel electrode involves reduction
` underset((s))(Hg_2Cl_2) + 2e^(-) to underset((l))(2Hg) + underset((aq))(2Cl^(-)) :.` It is redox electrode
B) Agar - agar : salt bridge `Zn//Zn_((1M))^(+2)//Cu_((1M))^(+2)//Cu` salt bridge
It is inverted U shaped tube filled with a jelly like substance agar -agar mined with an electrolyte like `KCl, KCl, KNO_3` (or) `NH_4NO_3`. It maintain electrical neutrality of cell used in ice creams
C) 0.1N KCl salt bridge
D) Quinhydrone , Pt/Quinhydrone/`H_((aq))^(+)`