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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
Comment, sulphuric acid is referred to as oil of vitriol.
Give reason for the following:
Red brown vapours are produced when concentrated sulphuric acid is added to hydrogen bromide.
Write a balanced chemical equation for each of the following reactions :
Action of dilute sulphuric acid on sodium hydroxide.
Distinguish between the following pairs of compounds using the reagent given in the bracket.
Ferrous sulphate solution and ferric sulphate solution. (Using sodium hydroxide solution)
How are the following conversion brought about? Give equation and condition:
Aqueous barium chloride to barium sulphate.
Choose the current answer from the options given below :
Which of the following gas dissolves in H2SO4 to give alum?
Some properties of sulphuric acid are listed below. Choose the property A, B, C or D which is responsible for the reaction (a) to (e). Some properties may be repeated.
A. Acid
B. Dehydrating agent
C. Non-volatile acid
D. Oxidizing agent
(a) \[\ce{C12H22O11 + nH2SO4 -> 12C + 11H2O + nH2SO4}\]
(b) \[\ce{S + 2H2SO4 -> 3SO2 + 2H2O}\]
(c) \[\ce{NaCl + 2H2SO4 -> NaHSO4 + HCl}\]
(d) \[\ce{CuO + 2H2SO4 -> CuSO4 + H2O}\]
(e) \[\ce{Na2CO3 + H2SO4 -> Na2SO4 + H2O + CO2}\]
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.
What property of Sulphuric acid is exhibited in the following case?
In the preparation of HCI gas when it reacts with Sodium chloride.
