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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 is the name given to the salts of sulphuric acid?
Give reasons for the following:
Brisk effervescence is seen when oil of vitriol is added to sodium carbonate.
Write a balanced chemical equation for each of the following reactions :
Action of dilute sulphuric acid on zinc sulphide.
How are the following conversion brought about? Give equation and condition:
Aqueous barium chloride to barium sulphate.
A, B, C and D summarise the properties of sulphuric acid depending on whether it is dilute or concentrated.
A = Typical acid property
B = Non-Volatile acid
C = Oxidising agent
D = Dehydrating agent
Choose the property (A, B, C or D) depending on which is relevant to each of the following :
(i) Preparation of hydrogen chloride gas
(ii) Preparation of copper sulphate from copper oxide
(iii) Action of cone, sulphuric acid on sulphur
Sulphuric acid is manufactured by the contact process.
Name the catalyst used.
Write a balanced chemical equation:
When hot and concentrated sulphuric acid reacts with the NaOH.
Write a balanced chemical equation:
When hot and concentrated sulphuric acid reacts with the carbon.
Concentrated sulphuric acid is both an oxidizing agent and a non-volatile acid. Write one equation. Each illustrates the above-mentioned properties of sulphuric acid.
Identify the following:
The element having electronic configuration 2, 8, 6.
