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

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Reaction of gold with aqua regia produces NO2 in the absence of air

Reaction of gold with aqua regia produces an anion having Au in +3 oxidation state

Aqua Regia is prepared by mixing conc. HCl and conc. HNO3 in 3 : 1 (v/v) ratio

The yellow colour of aqua regia is due to the presence of NOCl and Cl2

answer is B.

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Detailed Solution

Aquaregia is a mixture of conc.HCl and conc.HNO3 in 3:1 ratio. When gold dissolves in aquaregia, the species formed is AuCl4- in which gold is in +3 oxidation state. Au+HNO3+4HCl→H++AuCl4−+2H2O+NOIn the absence of air the reaction between gold and aquaregia NO2 will not be produced. Yellow colour is due to the presence of NOCl and Cl2.

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