Advertisements
Advertisements
Question
How would you separate gold from a mixture of gold and copper filling?
Advertisements
Solution
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.
APPEARS IN
RELATED QUESTIONS
Give a balanced chemical equation for Action of conc. Nitric acid on Sulphur
Name the gas that is produced in the given cases :
Sulphur is oxidized by concentrated nitric acid.
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.
Write a balanced equation and name the products formed when concentrated nitric acid is heated.
Identify the substance underlined:
The dilute acid which is an oxidizing agent.
Choose the correct word from the given options to complete the sentence :
Sulphur can be converted to sulphuric acid using __________ nitric acid.
Write the equation to show the reaction between the following:
Between copper and concentrated nitric acid.
Write balanced equation to show the reaction between the sulphur and hot concentrated nitric acid.
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.
