aqua regia वाक्य

Ruthenium dissolves in fused alkalis to give ruthenates ( ), is not attacked by acids ( even aqua regia ) but is attacked by halogens at high temperatures.
However, aqua regia does not dissolve or corrode silver, titanium, iridium, ruthenium, rhenium, tantalum, niobium, hafnium, osmium, or rhodium.
Gold resists attacks by individual acids, but it can be dissolved by the aqua regia ( nitro-hydrochloric acid ), so named because it dissolves gold.
In his attempts to produce pure platinum metal in 1804, W . H . Wollaston added mercuric cyanide to a solution of impure platinum metal in aqua regia.
If necessary, the tube may be filled with an oxidizing solution of aqua regia or piranha solution ( H 2 O 2 / H 2 SO 4 ).

The main problem with the process was that it required glass-lined containers due to the aqua regia, and mechanisms for safe handling of the radioactive material.
To get the gold to a very high level of purity ( 999 fine gold ) it is sometimes processed further with aqua regia to effectively remove all the impurities.
Despite its broad range of compounds in numerous oxidation states, osmium in bulk form at ordinary temperatures and pressures resists attack by all acids and alkalis, including aqua regia.
Chloroauric acid, HAuCl 4, the product formed when gold dissolves in aqua regia, is sometimes referred to as " gold chloride " or " acid gold trichloride ".
The discovery that aqua regia, a mixture of nitric and hydrochloric acids, could dissolve the noblest metal, gold, was to fuel the imagination of alchemists for the next millennium.