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JEE Advanced2019Chemistryp Block Elements (Group 15, 16, 17 & 18)Actual

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

Options

  1. AReaction of gold with aqua regia produces N O 2 in the absence of air
  2. BAqua regia is prepared by mixing conc. H C l and conc. H N O 3 in 3 : 1 v / v ratio
  3. CReaction of gold with aqua regia produces an anion having A u in + 3 oxidation state
  4. DThe yellow colour of a q u a r e g i a is due to the presence of N O C l and C l 2

Correct answer

B. Aqua regia is prepared by mixing conc. H C l and conc. H N O 3 in 3 : 1 v / v ratio

Step-by-step solution

Aqua regia is 3 past HCl and 1 part H N O 3 3 HCl + HNO 2 → NOCl + Cl 2 + 2 H 2 O Yellow colour is due to NOCl and  Cl 2 Au + Aqua Regia → HAuCl 4 +3 O.S of Au

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