State one relevant observation for the following: At the anode, when molten lead bromide is electrolyzed using graphite electrodes.

State relevant observations for the following: When copper sulphate solution is electrolyzed by using a platinum electrode.

State one relevant observation for each of the following: At the Anode when aqueous copper sulphate solution is electrolysed using copper electrodes.

State one relevant observation for the following: Platinum is added to aqua-regia.

What is observed when fused lead bromide is electrolysed using platinum electrodes ?

State one relevant observation for the following: Nitric oxide comes in contact with atmosphere.

State one relevant observation for the following reaction : Burning of ammonia in air.

State your observations in each of the following: At the electrodes when sodium argentocyanide soln. is electrolyzed using silver anode.

State one relevant observation for the following: Action of dilute hydrochloric acid on lead, nitrate solution.

State one relevant observation for the following: Anhydrous calcium chloride is exposed to air for some time