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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
Write a balanced chemical equation for each of the following reactions :
Action of dilute sulphuric acid on sodium hydroxide.
Name the following:
Products obtained by dissolving sulphur dioxide and chlorine in water.
Give reason for the following:
When diluting concentrated sulphuric acid, the acid should be added to water and not water to the acid.
How are the following conversions brought about? Give equation and condition:
Sulphur trioxide to sulphur acid.
How are the following conversion brought about? Give equation and condition:
Aqueous lead nitrate to lead sulphate.
Write a balanced chemical equation:
When hot and concentrated sulphuric acid reacts with the sulphur.
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 copper.
The following is the typical property of dilute acid. Complete it by inserting suitable words:
\[\ce{Base + Acid -> \underline{\phantom{.......}} + \underline{\phantom{.......}}}\]
The following is the typical property of dilute acid. Complete it by inserting suitable words:
\[\ce{Sulphite/hydrogen sulphite + Acid -> \underline{\phantom{.......}} + \underline{\phantom{.......}} + \underline{\phantom{.......}}}\]
