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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
State one relevant observation for the following:
When crystals of copper nitrate are heated in a test tube.
What is : aqua regia
Write a balanced equation and name the products formed when sodium hydrogen carbonate is added to nitric acid.
Name the Following:
Product obtained by the catalytic oxidation of ammonia.
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.
Write the equation to show the reaction between the following:
Between copper and concentrated nitric acid.
Write a balanced equation for following :
Action of cold and dilute nitric acid on copper
Write a balanced equation for following :
Action of conc. Nitric acid on sulphur
From the formulae listed below, Choose, one, corresponding to the salt having the given description:
AgCl, CuCO3, CuSO4.5H2O, KNO3, NaCl, NaHSO4, Pb(NO3)2, ZnCO3, ZnSO4, 7H2O.
On heating this, salt changes from green to black.
The diagram given below is a representation of the Industrial preparation of Nitric acid by Ostwald’s process. With respect to the process answer the following questions:
- Write the temperature and the catalyst required during the catalytic oxidation of ammonia.
- Give balanced chemical equation for the reaction occurring duringthe conversion of nitrogen dioxide to nitric acid.
