Questions in electrochemistry

Select	Question
	The element which can displace three other halogens from their compound is
	Consider certain observations about electrolysisI : Electric current is used to drive a non-spontaneous reactionII : Ecell is positive and is negativeIII : Cations and anions are discharged at the cathode and anode respectivelyIV : Over-voltage is responsible that a particular reaction takes place. Correct observations are :
	Anode mud is a
	Electrolysis of molten anhydrous calcium chloride produces
	On electrolysing a solution of dilute $H_2 SO_4$ between platinum electrodes, the gas evolved at the anode is
	During the electrolysis of fused NaCl, which reaction occurs at anode
	A solution of sodium sulphate in water is electrolysed using inert electrodes. The products at the cathode and anode are respectively
	In electrolysis of dilute $H_2 SO_4$ using platinum electrodes
	When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are Cathode Anode
	Which of the substances $Na, Hg, S, Pt$ and graphite can be used as electrodes in electrolytic cells having aqueous solutions