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Daniel CELL is a reversible cell
Lead storage battery is a reversible cell
`ZN//H_2SO_4//Ag ` cell is reversible
Any reversible cell will receive current flow from the external source when connected if its emf is less than that of the source.

SOLUTION :a) `Zn , Zn^(+2) , Cu^(+2) , Cu` reversible cell
b) `Pb_((s)) + Pbo_(2(s)) + 2H_2 So_(4(AQ)) underset("charging")overset("working")iff 2PbSo_(4(s)) + 2H_(2(L)o)` reversible


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