অ্যাকোয়া রেজিয়া বলতে বুঝায়-
Solution
Correct Answer: Option D
Aqua regia is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. Aqua regia is a yellow-orange (sometimes red) fuming liquid, so named by alchemists because it can dissolve the noble metals gold and platinum, though not all metals.
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