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| Q. |
One of the following is used to dissolve noble metals. That is – |
| A. | Nitric acid |
| B. | Hydrochloric acid |
| C. | Sulphuric acid |
| D. | Aqua ragia |
| Answer» D. Aqua ragia | |
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Explanation: Aqua regia ("royal water"), aqua aegis ("king's water"), 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, iridium, ruthenium, tantalum, osmium, rhodium and a few other metals are capable of withstanding its corrosive properties. |
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