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( I ) The noble metals like gold, platinum dissolve in aqua regia( II ) 3: 1 ratio of Conc HCl and Conc HNO3 is called aqua regia

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a

I and II both are true

b

I is true and II is false

c

I is false and II is true

d

I and II are false

answer is A.

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Detailed Solution

Aqua-regia is a mixture of three parts of concentrated hydrochloric acid and one part of concentrated nitric acid. This mixture is used to dissolve noble metals like gold and platinum. Au + NO–3 + 4H+ + 4Cl–→AuCl4– + NO + 2H2O3Pt + 4NO3– + 16H+ + 18Cl–→3PtCl62– + 4NO + 8H2O

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( I ) The noble metals like gold, platinum dissolve in aqua regia( II ) 3: 1 ratio of Conc HCl and Conc HNO3 is called aqua regia