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प्रश्न
What is the difference between the chemical nature of an aqueous solution of HCl and an aqueous solution of NH3
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उत्तर १
The chemical nature of an aqueous solution of HCl and an aqueous solution of NH3
1. The aqueous solution of HCl is acidic in nature. It can turn blue litmus to red.
2. The aqueous solution of NH3 is basic in nature. It can turn red litmus to blue.
उत्तर २
In its pure liquid state, HCl is unionised and does not conduct electricity. However, in aqueous solution, HCl is a good conductor of electric current, as the H+ ion interacts with water to create [H3O+].
\[\ce{H \phantom{.}^{\bullet}_{\bullet}\overset{\bullet\bullet}{\underset{\bullet\bullet}{Cl}}^{\bullet}_{\bullet}->[H2O][ionisation]H+ + \phantom{.}^{\bullet}_{\bullet}\overset{\bullet\bullet}{\underset{\bullet\bullet}{Cl}}^{\bullet}_{\bullet}}\]
\[\ce{H+ + H2O -> [HO+]}\]
Similarly, In an aqueous solution, NH3 acts as a weak alkali and dissociates partially.
\[\ce{NH4OH <=> [NH4+] +[OH-]}\]
संबंधित प्रश्न
Distinguish between the given pairs of compounds using the test given within brackets:
A lead salt and a zinc salt (using excess ammonium hydroxide)
How would you obtain salt from another salt?
Explain why It is necessary to find out the ration of reactants required in the preparation of sodium sulphate.
Give equation to prepare the following as directed
PbCO3 from Pb(NO3)
Define the following term:
Neutralisation
Choosing only substances from the list given in the box below, write equations for the reactions which you would use in the laboratory to obtain:
(i) Sodium sulphate
(ii) Copper sulphate
(iii) Iron (II) sulphate
(iv) Zinc carbonate
| Dilute sulphuric acid |
Copper, Iron, |
Copper carbonate, Sodium carbonate |
The diagram given below is to prepare iron (III) chloride in the laboratory.
(i) What is substance B?
(ii) What is the purpose of B?
(iii)Why is iron (III) chloride to be stored in a closed container?
(iv) Write the equation for the reaction between iron and chloride ?
From the list given below, select the word(s) required to correctly complete blanks (i) to (v) in the following passage. The words from the list are to be used only once. Write the answers as (a) (i), (ii) (iii) and so on. Do not copy the passage.
A solution M turns blue litmus red, so it must contain _______ ions; another, solution O turns red litmus blue and hence, must contain ______ ions.
The following is a list of methods for the preparation of salts.
A – direct combination of two elements.
B – reaction of a dilute acid with a metal.
C – reaction of a dilute acid with an insoluble base.
D – titration of a dilute acid with a solution of soluble base.
E – reaction of two solutions of salts to form a precipitate.
Choose from the above list A to E, the best method of preparing the following salt by giving a suitable equation in the following case:
Sodium sulphate.
For each of the salt: A, B, C and D, suggest a suitable method of its preparation.
D is a soluble salt of zinc.
