Noble metals can only be-dissolved inConc-HNO-3-Conc- HCl-Conc-H-2SO-4-Aqua-regia-

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Standard VII

Chemistry

pH and Its Importance

Noble metals ...

Question

Noble metals can only be dissolved in

Conc. ${H N O}_{3}$

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Conc. HCl

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Conc. $H_{2} {S O}_{4}$

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Aqua-regia

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Solution

The correct option is D
Aqua-regia

Noble metals cannot be dissolved by common strong acids like ${HNO}_{3}, HCl, H_{2} {SO}_{4}$ alone, but they are dissolved in aqua regia. It is a highly corrosive mixture of 2 strong acids in a fixed ratio, 1 part ${HNO}_{3}$ + 3 parts $HCl$ .

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Q. Which if the following noble metal cannot dissolve in aqua regia?

Aqua-regia was so named by alchemists because it can dissolve noble metals like gold and platinum. Can you identify the proper composition of Aqua-regia from the given options?

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Noble metals can only be dissolved in

The correct option is D Aqua-regia Noble metals cannot be dissolved by common strong acids like HNO3,HCl,H2SO4 alone, but they are dissolved in aqua regia. It is a highly corrosive mixture of 2 strong acids in a fixed ratio, 1 part HNO3 + 3 parts HCl.

The correct option is D
Aqua-regia

Noble metals cannot be dissolved by common strong acids like ${HNO}_{3}, HCl, H_{2} {SO}_{4}$ alone, but they are dissolved in aqua regia. It is a highly corrosive mixture of 2 strong acids in a fixed ratio, 1 part ${HNO}_{3}$ + 3 parts $HCl$ .