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Aquaregia is a mixture of...

Aquaregia is a mixture of 

A

`"Conc. "HNO_(3)+"Conc. "H_(2)SO_(4)" in 1:1 ratio"`

B

`"Conc. "HNO_(3)+"Conc. "H_(2)SO_(4)" in 1:3 ratio"`

C

`"Conc. "HNO_(3)+"Conc. "HCl" in 1:3 ratio"`

D

`"Conc. "HNO_(3)+"Conc. "HCl" in 1:1 ratio"`

Text Solution

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The correct Answer is:
C
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Gold dissolves in cyanide solution the presence of air to form [Au(CN)_(3)] which is stable in a cons solution. Au_((s))+CN_((s))^(-)+O_(2)+H_(2)O_(2) hArr [Au(CN)_(2)]_((aq))^(-)+OH_((aq))^(-) Aquaregia a 3 : 1 mixture of conc. HC and HNO_(3) was developed by the alchemists as a means to dissolve gold. The process is actually a Redox reaction. Au_((s))+NO_(3(aq))+Cl^(-) hArr AuCl_(4(aq))^(-)+NO_(2(g)) Gold is too noble to react with HNO_(3) However gold does react with a waregia becuase the complex AuCl_(4)^(-) forms Au_((aq))^(+3)+3e^(-) to Au_((s)) E^(theta)=15V to I AuCl_(4(aq))^(-)+3e^(-) to Au_((s))+4Cl_((q))^(-)E^(0)=1V to 2 Calculate the formation constant approximately, of Auct at 25^(@)C

AAKASH SERIES-VA GROUP ELEMENTS-PRACTICE EXERCISE
  1. A and B are two gases. ‘A’is identified with a glass rod dipped in NH,...

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  2. 98% pure nitric acid is obtained by

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  3. Aquaregia is a mixture of

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  4. The volume percentage of N(2) in air is 78. The Weight percentage of t...

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  5. When N(2) is obtained from NH(3) using oxide of copper, the change in ...

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  6. A mixture of potassium nitrite and ammonium chloride on heating libera...

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  7. Which statement is not correct for nitrogen?

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  8. If the nitrogen atoms are in a cyclic arrangement in hydrazoic acid, t...

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  9. The allotrope of phosphorous obtained by heating white phosphorous to ...

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  10. Which of the following can acts as both oxidant and redutant

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  11. Concentrated nitric acid oxidises phosphorous and iodine, respectively...

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  12. In solid state PCl(5), exists as ionic solid i.e., [X]^(+), [Y]^(-) sh...

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  13. In P(4)O(6) the number number of oxygen atoms bondedto each P atom is

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  14. P(4)O(10) on reactigwith watr does not form

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  15. The number of P-O bonds and lone pair of electrons present in P(4)O(6)...

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  16. Which is cyclic phosphate ?

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  17. Dinitrogem tetraoxide (N(2)O(4)) is a mixed anhydride because it

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  18. The oxyacid of phosphorous which has more non- ionisable hydrogens

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  19. PCl(5) exists but NCI(5) does not. This is because of

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  20. In the oxyacids of phosphorous the hybridisation of phosphorous is

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