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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.
Name the gas that is produced in the given case:
The action of cold and dilute nitric acid on copper
What is the fixation of Nitrogen?
Nitric acid cannot be concentrated beyond 68% by the distillation of a dilute solution of HNO3. State the reason.
The following statement is correct only under certain conditions. Rewrite the statement including the appropriate condition(s) and underline it in your answer.
Copper and nitric acid react together to produce nitrogen dioxide.
Choose the correct word from the given options to complete the sentence :
Sulphur can be converted to sulphuric acid using __________ nitric acid.
Write equation to show the reaction between the following:
Copper and concentrated nitric acid.
Fill in the blank using the appropriate words given below:
Cold, dilute nitric acid reacts with copper to give ______.
Fill in the blank using the appropriate words given below:
Hot, concentrated nitric add reacts with sulphur to form ______.
Write sqauential observation for effect of heat on Copper nitrate.
