Assertion :Aqua regia dissolves gold, which is insoluble in all other acids. Reason: In aqua regia HCl is a very strong acid and free chlorine is a very strong oxidising agent as it is present in high concentration. Nitric acid reacts with HCl to form nitrosyl chloride NOCl,chlorine and water. Nitrosyl chloride further decomposes to nitric oxide and chlorine. Chlorine dissolves gold oxidizing this metal Au to Au(III)ions forming soluble tetrachloroaurate(III)complex.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Assertion is correct but Reason is incorrect

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Both Assertion and Reason are incorrect

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In aqua regia HCl is a very strong acid and free chlorine is a very strong oxidising agent as it is present in high concentration as compared to nitric acid. Nitric acid reacts with HCl to form nitrosyl chloride NOCl,chlorine and water. Nitrosyl chloride further decomposes to nitric oxide and chlorine. Chlorine dissolves gold oxidizing this metal Au to Au(III)ions forming soluble tetrachloroaurate(III)complex.

Suggest Corrections

Similar questions

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

C l^{-}

O_{2}

{SiO}_{2}

{CaCO}_{3}

CaO

{CaCO}_{3}

{SiO}_{2}

Join BYJU'S Learning Program