McqMate
| Q. |
Aqua regia is a 1 : 3 mixture, by volume, of – |
| A. | conc, nitric acid and conc. hydrochloric acid |
| B. | conc. hydrochloric acid and conc. nitric acid |
| C. | conc. nitric acid and cone. sulphuric acid |
| D. | cone. sulphuric acid and cone. nitric acid |
| Answer» A. conc, nitric acid and conc. hydrochloric acid | |
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Explanation: Aqua regia or nitro-hydrochloric acid is a highly corrosive mixture of acids, a fuming yellow or red solution. The mixture is formed by freshly mixing concentrated nitric acid and hydrochloric acid, usually in a volume ratio of 1:3. It was named so because it can dissolve the so-called royal or noble metals, gold and platinum. However, titanium, iriditim, ruthenium, tantalum, osmium, rhodium and a few other metals are capable of withstanding its corrosive properties. |
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