Question

Aqua regia is a mixture of nitric acid and hydrochloric acid, Aqua regia is a yellow-orange
(sometimes red) fuming liquid, so named by alchemists because it can dissolve the noble metals,
though not all metals.
Aqua regia dissolves noble metals, though neither its constituent acid will do so alone, because, in
combination, each acid performs a different task. Nitric acid is a powerful oxidizer, which will
actually dissolve a virtually undetectable amount of noble metals, forming noble metals ions. The
hydrochloric acid provides a ready supply of chloride ions (Cl−
), which react with the noble metals
ions to produce anions, also in solution.
To polish the gold ornaments the goldsmith use aquaregia to clean jewellery .One day Poonam
went to a jewellery shop and asked the goldsmith to polish the old gold jewellery. Next day, when she
brought the jewellery, she found that there was a slight loss in its weight .She lodged a complaint to
the police about this incident.


(a) During its investigation, the police seized the solution used by the goldsmith and sent It forensic
lab.The lab technician detected traces of gold in it .why?

(b)Write name and symbol of two noble metals

(c)The latin name of aqua regia is

(d)The yellow-orange (sometimes red) and fuming nature of Aqua regia is a due to present of

Answer 1

Answer:

b) Aqua regia is a mixture of concentrated hydro chloric and hydric acid in the ratio 3:1 and can dissolve noble metals like gold....

C) The short list of chemically noble metals

1. ruthenium (Ru), 2.rhodium (Rh), 3. palladium (Pd), 4.osmium (Os), 4.platinum (Pt), and gold (Au).

D) The latin name of Aqua regia is "Royal water".

E) because it can dissolve the noble metals, though not all metals.