2. Solved Papers
  3. AFMC

AFMC AFMC Solved Paper-2003

  • question_answer
    In aqua-regia the ratio of cone. \[\text{HN}{{\text{O}}_{\text{3}}}\]and cone. \[\text{HCl}\]present is:

    A) 1 : 3                                       

    B) 3 : 1

    C) 2:3                                         

    D) 3:2

    Correct Answer: A

    Solution :

    Aqua-regia is a mixture of cone. \[HN{{O}_{3}}\]and conc. HCl in the ratio 1 : 3. Noble metals like gold and platinum are highly unreactive but react with aqua-regia forming respective chlorides \[\underbrace{HN{{O}_{3}}}_{aquaregia}+3HCl\xrightarrow{{}}\underset{Nitrosyl\,chloride}{\mathop{NOCl}}\,+2{{H}_{2}}O+2Cl\] \[Au+3Cl\xrightarrow{{}}AuC{{l}_{3}}\] \[Pt+4Cl\xrightarrow{{}}PtC{{l}_{4}}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner