Questions in electrochemistry

Select	Question
	A concentration cell is a Galvanic cell in which
	Which of the following are concentration cells
	Consider the following statements about a Galvanic cell I : Electrons flow through ${{H}_{2}}O$ (medium) from anode to cathode II : Electrons flow through wire from anode to cathode III : Salt bridge is necessary to complete the electrical circuit Select correct alternate (s)
	The following concentration cell is a step-up cell: $Zn\,(s)\|Z{{n}^{2+}}(aq,\,0.20M)\|KCl(sat'd)\|Z{{n}^{2+}}(aq,\,2.0M)\|Zn\,(s)$; Choose the correct option
	The cell formed by the two-redox couple $o{{x}_{1}}/re{{d}_{1}}$ and $o{{x}_{2}}/re{{d}_{2}}$ may be denoted by $re{{d}_{1}},\,o{{x}_{1}}\|\|re{{d}_{2}},\,o{{x}_{2}}$ The cell reaction is
	Which of the following statements are incorrect for an electrode concentration cell
	“Maintenance-free” batteries now in use in place of common batteries have
	Emf of a cell in terms of reduction potential of its left and right electrodes is
	Standard electrode potential of NHE electrode at 298 K is
	Expression representing the cell potential (E cell) in term of reduction potential is