Question : Which of the following liquids can dissolve noble metals such as Gold and Platinum?
Option 1: Formic acid
Option 2: Aqua regia
Option 3: Acetic acid
Option 4: Chloroform
Correct Answer: Aqua regia
Solution : The correct option is Aqua Regia.
Aqua regia, a mixture of concentrated Nitric acid (HNO3) and hydrochloric acid (HCl), can dissolve noble metals like Gold and Platinum. The Nitric acid oxidizes the metal, while the Hydrochloric acid provides chloride ions to form soluble metal chlorides. This powerful solvent is known for its ability to dissolve noble metals, making it useful in various chemical applications and refining processes.
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Question : Sour taste of "Coca cola" is due to the presence of
Option 1: Acetic acid
Option 2: Phosphoric acid
Option 3: Hydrochloric acid
Option 4: Formic acid
Question : Which of the following metals in pure form has the highest melting point?
Option 1: Gold
Option 2: Tungsten
Option 3: Copper
Option 4: Platinum
Question : Which of the following is not a food preservative?
Option 1: Aqua regia
Option 2: Vinegar
Option 3: Sodium chloride
Option 4: Sodium nitrite
Question : In alchemy, aqua fortis is the classical name of which chemical compound that is used chiefly in the manufacture of explosives and fertilisers, and in organic synthesis?
Option 1: Nitric acid
Option 2: Formic acid
Option 3: Chloric acid
Option 4: Hydrobromic acid
Question : Which acid makes the atmosphere of Venus have thick white and yellowish clouds?
Option 1: Sulphuric acid
Option 2: Nitric acid
Option 4: Hydrochloric acid
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