Question

Platinum metal can be dissolved in:

• A. hot conc. HCl
• B. hot conc. $HN{O}_3$
• C. hot dil. $H_{2}S{O}_4$
• D. a mixture of conc. HCl and $HN{O}_3$

Answer 1

The correct option is D a mixture of conc. HCl and $HN{O}_3$

• Traditional aqua regia is a mixture of concentrated nitric and hydrochloric acids in a ratio of 1:3 that can dissolve noble metals such as gold, platinum and palladium, even though the metals are not soluble in either acid alone.
  
• Hence option D is correct answer.