Advertisements
Advertisements
प्रश्न
How will you distinguish between dilute H2SO4 and conc. H2SO4 ?
उत्तर
Difference between dilute H2SO4 and Conc. H2SO4 :
| S.NO. | Dilute Sulphuric acid | Concentrated sulphuric acid |
| 1 | Barium chloride test : Barium chloride is added to dilute sulphuric acid white ppt.s of barium sulphate is formed. The precipitate is insoluble in dil.hydrochlroic acid or nitric acid. \[\ce{BaCl2 + H2SO4 -> BaSO4 v + 2HCl}\] |
Addition to copper : Conc. sulphuric acid is added to copper and heated. Sulphur dioxide, which is colourless gas with the smell of burnt sulphur is evolved. SO2 gas turns K2Cr2O7 paper green. |
| 2 | Lead nitrate test : Lead nitrate is added to dil. sulphuric is acid. White ppt. of lead sulphate is formed. The ppt. is insoluble in dil. Hydrochloric acid or nitric acid. \[\ce{Pb(NO3)2 + H2SO4 -> PbSO4 v + 2HNO3}\] |
Addition of common salt : Common salt is added to conc. sulphuric acid. Hydrogen chloride a colourless pungent smelling acidic gas is evolved. Dense white fumes are seen if a rod dipped in ammonia solution is brought near it. \[\ce{NaCl + H2SO4 -> NaHSO4 + HCl}\] |
APPEARS IN
संबंधित प्रश्न
State your observations when Concentrated Sulphuric acid is added to Sugar Crystals
Give balanced chemical equations for the action of sulphuric acid on the following:
Sulphur
Give one equation to show the following properties of sulphuric acid:
As a non-volatile acid
Give two balanced reactions of each type to show the following property of sulphuric acid:
Non-volatile nature
Give reason for the following:
When concentrated sulphuric acid is exposed to air, its volume increases and it becomes slightly dilute.
The following statement is correct only under certain conditions. Rewrite the statement including the appropriate conditions.
Oxalic acid reacts with sulphuric acid to produce carbon monoxide and carbon dioxide.
What property of sulphuric acid is shown by the reaction of concentrated sulphuric acid when heated with :
(i) Potassium nitrate
(ii) carbon
Give one equation to show the following properties of sulphuric acid:
As a non-volatile acid
State your observation of the following case:
When dilute hydrochloric acid is added to sodium carbonate crystals.
Hydrogen chloride gas is prepared in the laboratory by the action of concentrated sulphuric acid on sodium chloride.
State the method of collection of the gas formed above.
