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JEE Advanced 2019Paper 2
Exam
JEE Advanced
Year
2019
Paper
Paper 2
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

JEE Advanced 2019 · Paper 2 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

With reference to aqua regia , choose the correct option(s).

With reference to aqua regia, choose the correct option(s).

Options

  1. AReaction of gold with aqua regia produces NO2{NO}_{2} in the absence of air
  2. BAqua regia is prepared by mixing conc. HClHCl and conc. HNO3{HNO}_{3} in 3: 1\left(v / v\right) ratio
  3. CReaction of gold with aqua regia produces an anion having AuAu in +3+ 3 oxidation state
  4. DThe yellow colour of aquaregiaaquaregia is due to the presence of NOClNOCl and Cl2{Cl}_{2}

Correct answer

B. Aqua regia is prepared by mixing conc. HClHCl and conc. HNO3{HNO}_{3} in 3: 1\left(v / v\right) ratio

Step-by-step solution

Aqua regia is 3 past HCl and 1 part HNO3HN{O}_{3}
3HCl+HNO2→NOCl+Cl2+2H2O(Yellow colour is due to NOCl andCl2)3\text{HCl} + {\text{HNO}}_{\text{2}} \to \mathop{\text{NOCl} + {\text{Cl}}_{2} + 2{\text{H}}_{\text{2}}\text{O}}_{\left(\text{Yellow colour is due to NOCl and}{\text{Cl}}_{\text{2}}\right)}
Au+Aqua Regia→HAuCl4(+3 O.S of Au)\text{Au} + \text{Aqua Regia} \to \mathop{{\text{HAuCl}}_{\text{4}}}_{\left(\text{+3 O.S of Au}\right)}
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