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प्रश्न
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.
उत्तर
Sodium chloride solution and sodium nitrate solution can be distinguished by using conc. sulphuric acid. To the salt solution, add freshly prepared ferrous sulphate solution and pour a few drops of conc. H2SO4 along the sides of the tube. If it's sodium nitrate solution then a brown ring would appear at the junction of the two liquid layers. But if its sodium chloride solution, it would not undergo any visible reaction.
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संबंधित प्रश्न
Identify the gas evolved and give the chemical test in the following cases
Dilute hydrochloric acid reacts with sodium sulphite.
Name the acid used for the preparation of hydrogen chloride gas in the laboratory. Why is this particular acid preferred to other acids?
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?
Give the balanced equation for the laboratory preparation of hydrogen chloride gas reaction.
Name the drying agents phosphorus pentoxide and calcium oxide are good drying agent but they cannot be used to dry hydrogen chloride gas. Why?
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 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.
Explain, why (or give reasons for)
Hydrogen chloride is not collected over water.
Explain, why (or give reasons for)
HCI gas does not conduct electricity, but hydrochloric acid conducts electricity.
Describe an experiment to prove the following:
HCI gas contains the element chlorine.
What is aqua-regia?
Choose the correct answer from the options given below:
Dilute hydrochloric acid solution cannot be concentrated by boiling beyond
Complete and balance the equations:
KMnO4 + HCI → _______+ _______ + _______ + ______ + 8H2O
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 sulphate solution and sodium chloride solution.
State a relevant reason for the following:
Hydrogen chloride gas cannot be dried over quick lime.
Identify the gas evolved in the following reaction:
\[\ce{MnO2}\] reacts with concentrated \[\ce{HCl}\].
