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प्रश्न
How will you distinguish between dilute H2SO4 and conc. H2SO4 ?
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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. \[\ce{NaCl + H2SO4 -> NaHSO4 + HCl}\] |
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संबंधित प्रश्न
Give two balanced reactions of each type to show the following properties of sulphuric acid:
Hygroscopic nature
What would you observe in the following case?
Concentrated sulphuric acid is added to equal volumes of cold water.
Give reason for the following:
When barium chloride is added to dilute sulphuric acid, a white precipitate is formed.
How are the following conversion brought about? Give equation and condition:
Dilute sulphuric acid to hydrogen.
How are the following conversion brought about? Give equation and condition:
Sucrose to sugar charcoal.
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.
A, B, C and D summarize the properties of sulphuric acid depending on whether it is dilute or concentrated. Choose the property (A, B, C or D), depending on which is relevant to each of the preparations (i) to (ii).
A. Dilute acid (typical acid properties)
B. Non-volatile acid
C. Oxidizing agent
D. Dehydrating agent
(i) Preparation of hydrogen chloride.
(ii) Preparation of ethane from ethanol
(iii) Preparation of copper sulphate from copper oxide.
State one appropriate observation of the following:
Concentrated sulphuric acid is added dropwise to a crystal of hydrated copper sulphate.
Identify the salts P and Q from the observation given below:
On performing the flame test salt P produces a lilac coloured flame and its solution gives a white precipitate with silver nitrate solution. Which is soluble in ammonium hydroxide solution.
Name the gas released when sodium carbonate is added to a solution of sulphur dioxide.
