Solution:
A freshly made mixture of one part concentrated nitric acid and three parts concentrated hydrochloric acid is known as aqua-regia. Gold and platinum are rare metals that are insoluble in most reagents but soluble in aqua-regia.
What is aqua-regia? Name two special metals which are insoluble in common reagents but dissolve in aqua-regia.
What is aqua-regia? Name two special metals which are insoluble in common reagents but dissolve in aqua-regia.