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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
State the conditions required for the given reaction to take place:
Any two conditions for the conversion of sulphur dioxide to sulphur trioxide
Name the Following:
The property used to prepare HCl and HNO3 from H2SO4.
Give reason for the following:
Sulphuric acid can form two kinds of salts with sodium chloride.
How are the following conversion brought about? Give equation and condition:
Sodium chloride to hydrogen chloride.
Why is sulphuric acid known as king of chemicals and oil vitriol ?
Give main difference between drying agent and dehydrating agent.
Which concentrated acid oxidizes sulphur directly to sulphuric acid ? Write the equation for the same. What is the name of the process by which sulphuric acid is manufactured ? Name the catalyst used in the process.
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.
Give one equation to show the following property of sulphuric acid:
As a non-volatile acid
Differentiate between the following pair based on the criteria given in the bracket:
Cane sugar and hydrated copper sulphate [using concentrated H2SO4]
