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4 months ago

Chemistry Class 12th

Aqua regia is used for dissolving noble metals (Au, Pt, etc.). The gas evolved in this process is:
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R
Raj Pandey

Contributor-Level 9

Aqua regia is a mixture of concentrated nitric acid (HNO?) and concentrated hydrochloric acid (HCl), optimally in a molar ratio of 1:3. The reaction between them produces nitrosyl chloride (NOCl), chlorine gas (Cl?), and water. The potent oxidizing nature comes from these products, which can dissolve noble metals like gold and platinum. The overall reaction often shows the formation of nitric oxide (NO).
HNO? + 3HCl → NOCl + Cl? + 2H?O
The nitrosyl chloride can further decompose: 2NOCl → 2NO + Cl?. The gas evolved in the process is Nitric Oxide (NO).

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4 months ago

Chemistry Solutions

x g of NaCl is added to water in a beaker with a lid. The temperature of the system is raised from 1°C to 25°C. Which out of the following plots, is best suited for the change in the molarity ( M ) of the solution with respect to temperature? [Consider the solubility of NaCl remains unchanged over the temperature range]
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