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With reference to aqua regia, choose the correct option(s).
  • a)
    Reaction of gold with aqua regia produces NO2 in the absence of air
  • b)
    Aqua regia is prepared by mixing conc. HCl and conc. HNO3 in 3 : 1 (v/v) ratio
  • c)
    Reaction of gold with aqua regia produces an anion having Au in +3 oxidation state
  • d)
    The yellow colour of aqua regia is due to the presence of NOCl and Cl2
Correct answer is option 'B,C,D'. Can you explain this answer?
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With reference to aqua regia, choose the correct option(s).a)Reaction ...

(4) Yellow colour of aqua regia is due to it's decomposition into NOCl(orange yellow) and Cl2(greenish yellow).
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With reference to aqua regia, choose the correct option(s).a)Reaction ...
Aqua Regia

Aqua regia is a mixture of concentrated hydrochloric acid and concentrated nitric acid in a 3:1 (v/v) ratio. It is a highly corrosive and strong oxidizing agent that is used to dissolve noble metals such as gold and platinum.

Reactions of Gold with Aqua Regia

When gold is reacted with aqua regia, the following reactions take place:

- Au + 3HCl + 4HNO3 → Au(NO3)3 + 3NO2 + 3H2O + 3Cl
- Au + HNO3 + 4HCl → AuCl4^- + NO + 2H2O

From these reactions, we can conclude the following:

- Reaction of gold with aqua regia produces NO2 gas in the absence of air.
- The anion produced during the reaction of gold with aqua regia has Au in the 3 oxidation state.
- The yellow color of aqua regia is due to the presence of NO2 and Cl2 gases.

Conclusion

In conclusion, aqua regia is a powerful and highly corrosive mixture of concentrated hydrochloric acid and concentrated nitric acid. It is used to dissolve noble metals such as gold and platinum. When gold is reacted with aqua regia, it produces NO2 gas, an anion with Au in the 3 oxidation state, and gives aqua regia its yellow color due to the presence of NO2 and Cl2 gases.
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Consider a solution of CH3COONH4 which is a salt of weak acid weak base. Theequilibrium involved in the solutions are :If we add these three reactions, then the net reaction isBoth CH3C00- and NH4 get hydrolysed independently and their hydrolysis depends on(i) their initial concentration(ii) the value of Kh which is Since both of the ions were produced from the same salt, their initial concentrations are same . Therefore unless untial the value of Kw/Kaand Kb is same, the degree of hydrolysis of ion cant be same.To explain why we assume that degree of hydrolysis of cation and anion is same, we need to now look at the third reaction i.e., combination of H+ and OH ions. It is obvious that this reaction happens only because one reaction produced H+ ion and the other produced OH ions. We can also note that this reaction causes both the hydrolysis reaction to occur more since their product ions are being consumed. Keep this thing in mind that the equilibrium which has smaller value of equilibrium conxtant is affected more by the common ion effect. For the same reason if for any reason a reaction is made to occur to a greater extent by the consumption of any one of the product ion, the reaction with the smaller value of equilibrium constant tends to get affected more.Therefore we conclude that firstly the hydrolysis of both the ions ocurs more in the presence of each other (due to consumption of the product ions) than in each other is absence. Secondly the hydrolysis of the ion which occurs to a lesser extent (due to smaller value of Kh) is affected more than the one whose Kh is greater. Hence we can see that the degree of hydrolysis of both the ions would be close to each other when they are getting hydrolysed in the presence of each other.Q.In a solution of NaHCO3 , the amphiprotic anion can under ionization to form H+ ion and hydrolysis to from OH ion.To calculat PH, suitable approximation is

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With reference to aqua regia, choose the correct option(s).a)Reaction of gold with aqua regia produces NO2 in the absence of airb)Aqua regia is prepared by mixing conc. HCl and conc. HNO3 in 3 : 1 (v/v) ratioc)Reaction of gold with aqua regia produces an anion having Au in +3 oxidation stated)The yellow colour of aqua regia is due to the presence of NOCl and Cl2Correct answer is option 'B,C,D'. Can you explain this answer?
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With reference to aqua regia, choose the correct option(s).a)Reaction of gold with aqua regia produces NO2 in the absence of airb)Aqua regia is prepared by mixing conc. HCl and conc. HNO3 in 3 : 1 (v/v) ratioc)Reaction of gold with aqua regia produces an anion having Au in +3 oxidation stated)The yellow colour of aqua regia is due to the presence of NOCl and Cl2Correct answer is option 'B,C,D'. Can you explain this answer? for JEE 2025 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about With reference to aqua regia, choose the correct option(s).a)Reaction of gold with aqua regia produces NO2 in the absence of airb)Aqua regia is prepared by mixing conc. HCl and conc. HNO3 in 3 : 1 (v/v) ratioc)Reaction of gold with aqua regia produces an anion having Au in +3 oxidation stated)The yellow colour of aqua regia is due to the presence of NOCl and Cl2Correct answer is option 'B,C,D'. Can you explain this answer? covers all topics & solutions for JEE 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for With reference to aqua regia, choose the correct option(s).a)Reaction of gold with aqua regia produces NO2 in the absence of airb)Aqua regia is prepared by mixing conc. HCl and conc. HNO3 in 3 : 1 (v/v) ratioc)Reaction of gold with aqua regia produces an anion having Au in +3 oxidation stated)The yellow colour of aqua regia is due to the presence of NOCl and Cl2Correct answer is option 'B,C,D'. Can you explain this answer?.
Solutions for With reference to aqua regia, choose the correct option(s).a)Reaction of gold with aqua regia produces NO2 in the absence of airb)Aqua regia is prepared by mixing conc. HCl and conc. HNO3 in 3 : 1 (v/v) ratioc)Reaction of gold with aqua regia produces an anion having Au in +3 oxidation stated)The yellow colour of aqua regia is due to the presence of NOCl and Cl2Correct answer is option 'B,C,D'. Can you explain this answer? in English & in Hindi are available as part of our courses for JEE. Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free.
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