Questions in electrochemistry

Select	Question
	Which of the following statements is true for fuel cells
	The cell reaction of the Galvanic cell, $C{{u}_{(s)}}\|C{{u}^{2+}}_{(aq)}\|\|H{{g}^{2+}}_{(aq)}\|H{{g}_{(l)}}$ is [EAMCET 2003]
	Hydrogen-oxygen fuel cells are used in spacecraft to supply
	Which of the following statements is correct, Galvanic cell converts
	Which colourless gas evolves, when $N{{H}_{4}}Cl$ reacts with zinc in a dry cell battery
	Which of the following reactions occurs at the cathode during the charging of a lead storage battery
	For the electrochemical cell $\overset{\Theta }{\mathop{Ag}}\,\|AgCl(s),\,KCl\,(aq)\|\|AgN{{O}_{3}}(aq)\|\overset{\Theta }{\mathop{Ag}}\,$; the overall cell reaction is
	In an ${{H}_{2}}-{{O}_{2}}$ fuel cell,
	If a chemical reaction is carried out in a fuel cell, the maximum amount of useful work that can be obtained from the cell is
	For a cell reaction, $2A{{g}^{+}}+Cu\to C{{u}^{2+}}+2Ag$; Schematic diagram indicating the migration of cation, anion and electrons is