Assertion :Free chlorine is the Oxidising agent in aqua regia. Reason: It is present in high concentration as compared to nitric acid. Nitric acid reacts with HCl to form nitrosyl chloride NOCl,chlorine and water.

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

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

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$H C l$ 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 $H C l$ to form nitrosyl chloride $N O C l$ , chlorine and water. Nitrosyl chloride further decomposes to nitric oxide and chlorine.
${H N O}_{3} + H C l \to N O C l + {C l}_{2} + H_{2} O N O C l \to N O + {C l}_{2}$

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