Question

a) Convert two soluble metallic nitrates to insoluble metallic chloride using dil. HCl. [5 MARKS]
b) Which component is the oxidising agent in aqua regia?
c) Which of the two - a solution of HCl in water or in toluene is an electrolyte? Justify.

Answer 1

a) 2 Marks
b) 1 Mark
c) 2 Marks

a) $Pb(N{O}_3{)}_2+HCl\to PbC{l}_2+HN{O}_3$
$AgN{O}_3+HCl\to AgCl+HN{O}_3$

b) Aqua regia is a mixture of one part conc. $HN{O}_3$ and three parts of conc. HCl. In aqua regia $HN{O}_3$ is the oxidising agent.

c) Solution of HCl in water is an electrolyte because HCl dissociates in water to form hydrogen ions and chloride ions which conduct electricity. HCl in toluene does not dissociate to form ions, so it is not an electrolyte.