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प्रश्न
How would you separate gold from a mixture of gold and copper filling?
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उत्तर
Gold will dissolve only in aqua regia i.e., a mixture of conc. hydrochloric acid and conc. nitric acid in 1:3 but copper will dissolve in nitric acid.
To separate gold from a mixture of gold and platinum add some nitric acid to the mixture, gold will remain undissolved hence can be filtered.
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संबंधित प्रश्न
Name the gas that is produced in the given cases :
Sulphur is oxidized by concentrated nitric acid.
During thunderstorm, rain water contains nitric acid. Explain with reactions.
Give reasons for the following:
In the laboratory preparation of nitric acid, the mixture of concentrated sulphuric acid and sodium nitrate should not be heated very strongly above 200°C.
Identify the substance underlined:
The dilute acid which is an oxidizing agent.
Name the Following:
Product obtained by the catalytic oxidation of ammonia.
What is the oxidizing agent in ostwald process ?
Write the equation of the following reaction.
Sulphur can be converted to sulphuric acid using concentrated nitric acid.
Write equation to show the reaction between the following:
Copper oxide and dilute nitric acid.
Write a balanced equation for following :
Action of conc. Nitric acid on sulphur
Write sqauential observation for effect of heat on Copper nitrate.
