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What causes aqua regia's reaction?

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Its fumes and yellow color are caused by reaction of nitric acid, HNO 3 , with hydrogen chloride, HCl, to form nitrosyl chloride, NOCl, chlorine, Cl 2 , and water; both chlorine and nitrosyl chloride are yellow-colored and volatile.

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Get more facts and information about aqua regia from The Columbia Encyclopedia, Sixth Edition at Encyclopedia.com.

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