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प्रश्न
The given set up in the figure is for the preparation of an acid.
- Name the acid prepared by this method.
- Name the reactants used.
- Why an empty flask is used?
- What is the drying agent used? Why is this drying agent chosen?
- What is the role of the inverted funnel in the arrangement?
उत्तर
- Hydrochloric acid is prepared by this method.
- The reactants are sodium chloride and Sulphuric acid.
- Empty flask serves as an anti-suction device. If back suction happens, water will collect in it and not reach the generating flask. Otherwise, if water enters the flask, the reaction will stop and may cause an explosion because of the heat produced.
- Cone. \[\ce{H2SO4}\] is the drying agent used. Other drying agents, such as \[\ce{P2O5}\] or quick lime \[\ce{(CaO)}\], cannot be used because they react with hydrogen chloride.
- The purpose of an inverted funnel is to stop back-suction. It also has a large surface area for absorption of \[\ce{HCl}\] gases.
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संबंधित प्रश्न
Certain blank spaces are left in the following table and these are labelled as A, B, C, D
and E. Identify each of them
| Lab preparation of | Reactants used | Products formed | Drying Agent | Method of collection |
|
| 1 | HCl gas | NaCl + H2SO4 |  |
conc. H2SO4 |  |
| 2 | NH3 gas |
|
Mg(OH)2 NH3 |
 |
 |
The following are pertaining to the laboratory preparation of hydrogen chloride gas.
State a safety precaution you would take during the preparation of hydrochloric acid.
For the preparation of hydrochloric acid in the laboratory:
Why is the direct absorption of hydrogen chloride gas in water not feasible?
Draw a labelled diagram for the laboratory preparation of hydrogen chloride gas and answer the following.
- Name the acid used. Why is this particular acid preferred to other acids?
- Give the balanced equation for the reaction.
- Name the drying agent used in drying hydrogen chloride gas.
- Phosphorous pentoxide and calcium oxide are good drying agents, but they cannot be used to dry hydrogen chloride gas. Why?
- Why is the direct absorption of \[\ce{HCl}\] gas in water not feasible?
- What arrangement is done to dissolve \[\ce{HCl}\] gas in the water?
Name the drying agents used in drying hydrogen chloride gas.
Explain why when the stopper of a bottle full of hydrogen chloride gas is opened, there are fumes in the air.
Explain why a solution of hydrogen chloride in water turns blue litmus red and conducts electricity, while a solution of the same gas in toluene:
- has no effect on litmus, and
- does not conduct electricity.
Explain why thick white fumes are formed when a glass rod dipped in \[\ce{NH4OH}\] is brought near the mouth of a bottle full of \[\ce{HCl}\] gas.
Explain why dry hydrogen chloride gas does not affect a dry strip of blue litmus paper but it turns red in the presence of a drop of water.
Write the main difference in hydrogen chloride gas and hydrochloric acid.
Name the gas produced when chlorine water is exposed to sunlight.
What is aqua-regia?
Mention the reaction condition and give balanced equation to obtain : HCl gas from common salt
Choose the correct answer from the options given below:
Dilute hydrochloric acid solution cannot be concentrated by boiling beyond
Write the equation for the reaction which takes place in question(a).
What property of hydrogen chloride is demonstrated when it is collected by downward delivery (upward displacement) ?
One chemical test that would enable you to distinguish between the following pair of chemicals. Describe what happens with each chemical or state 'no visible reaction'.
Sodium chloride solution and sodium nitrate solution.
One chemical test that would enable you to distinguish between the following pair of chemicals. Describe what happens with each chemical or state 'no visible reaction'.
Sodium chloride solution and sodium nitrate solution.
Give one test to distinguish between the following pair of chemicals.
Sodium nitrate solution and sodium chloride solution.
In the laboratory preparation, HCl gas is dried by passing through ______.
