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प्रश्न
How will you distinguish between conc. HCl and conc. H2SO4?
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उत्तर
Conc. HCl and Conc. H2SO4:
| S.No. | Conc. HCl | Conc. H2SO4 |
| 1. | Addition to silver nitrate : When conc. HCI is added to silver nitrate white ppt. of silver chloride are formed. \[\ce{AgNO3 + HCl -> AgCl + HNO3}\] White ppt. of silver chloride dissolve in excess of ammonium hydroxide. |
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. \[\ce{Cu + 2H2SO4 -> CuSO4 + 2H2O + SO2}\] SO2 gas turns K2Cr2O7 paper green. |
| 2. | A glass rod dipped in conc. HCl is brought in contact with ammonia gas, curdy white fumes of ammonium chloride is seen around the glass rod. | Glucose when conc. Sulphuric acid \[\ce{\underset{\text{blue}}{CuSO4.5H2O} ->[conc.H2SO4] CuSO4 + \underset{\text{white}}{5H2O}}\] |
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संबंधित प्रश्न
What would you observe in the following case?
100ml of 98% sulphuric acid is kept open.
Give reason for the following:
When diluting concentrated sulphuric acid, the acid should be added to water and not water to the acid.
Give examples of the use of sulphuric acid as
An electrolyte in everyday use
In using sulphuric acid to prepare other acids, as mentioned above, which property of sulphuric acid is used ?
Making use only of substances chosen from those given below:
Dilute sulphuric acid
Sodium carbonate
Zinc
Sodium sulphite
Lead
Salcium carbonate
Give the equation for the reaction by which you could obtain:
(i) Hydrogen
(ii) Sulphur dioxide
(iii) Carbon dioxide
(iv) Zinc Carbonate (two steps required).
Sulphuric acid is manufactured by the contact process.
Name the chemical used to dissolve SO3 and also name the product formed. Give all the main reactions to this process.
Write a balanced chemical equation:
When hot and concentrated sulphuric acid reacts with the sugar.
Write a balanced chemical equation:
When hot and concentrated sulphuric acid reacts with the carbon.
The following is the typical property of dilute acid. Complete it by inserting suitable words:
\[\ce{Active metal + Acid -> \underline{\phantom{.......}} + \underline{\phantom{.......}}}\]
Identify the following:
The element having electronic configuration 2, 8, 6.
