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

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

C l_{2}

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Aqua regia is prepared by mixing conc. HCl and conc.

H N O_{3}

in 3 : 1 (v/v) ratio

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

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Reaction of gold with aqua regia produces

N O_{2}

in the absence of air

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Solution

The correct option is C Reaction of gold with aqua regia produces an anion having Au in +3 oxidation state
a) Yellow colour of aqua regia is due to NOCl and $C l_{2}$
b) In aqua regia $H C l$ and $H N O_{3}$ are in 3 : 1 ratio.
c) $A u + 3 H N O_{3} + 4 H C l \to H A u C l_{4} + 3 N O_{2} + 3 H_{2} O$
d) $N O_{2}$ is produced in the presence of air

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

The correct option is C Reaction of gold with aqua regia produces an anion having Au in +3 oxidation statea) Yellow colour of aqua regia is due to NOCl and Cl2 b) In aqua regia HCl and HNO3 are in 3 : 1 ratio. c)Au+3HNO3+4HCl→HAuCl4+3NO2+3H2O d) NO2 is produced in the presence of air