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प्रश्न
A chemical A is used for the preparation of washing soda to recover ammonia. When CO2 is bubbled through an aqueous solution of A, the solution turns milky. It is used in whitewashing due to disinfectant nature. What is the chemical formula of A?
पर्याय
Ca(HCO3)2
CaO
Ca(OH)2
CaCO3
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उत्तर
Ca(OH)2
Explanation:
The chemical formula of A is Ca(OH)2. Sodium carbonate is prepared by Solvay's process. In this process, ammonia is recovered when ammonium chloride reacts with calcium hydroxide. On reacting NH4Cl with Ca(OH)2, calcium chloride is obtained as a by-product. The reaction is given below.
\[\ce{2NH4Cl + Ca(OH)2 -> 2NH3 + CaCl2 + H2O}\]
When CO2 is bubbled through an aqueous solution of Ca(OH)2 the solution turns milky. It is used in whitewashing due to its disinfectant nature.
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संबंधित प्रश्न
Find the oxidation state of sodium in Na2O2.
Discuss the various reactions that occur in the Solvay process.
Potassium carbonate cannot be prepared by Solvay process. Why?
Starting with sodium chloride how would you proceed to prepare sodium metal.
Describe two important uses of each of the following caustic soda.
Describe two important uses of the following sodium carbonate.
What happens when sodium metal is dropped in water?
What happens when sodium metal is heated in the free supply of air?
State as to why a solution of Na2CO3 is alkaline?
The formula of soda ash is ______.
When Zeolite, which is hydrated sodium aluminium silicate is treated with hard water, the sodium ions are exchanged with which of the following ion(s)?
(i) H+ ions
(ii) Mg2+ ions
(iii) Ca2+ ions
(iv) \[\ce{SO^{2-}4}\] ions
Complete the following reactions.
\[\ce{O^{2-}2 + H2O ->}\]
Complete the following reactions.
\[\ce{O^{-}2 + H2O ->}\]
Match the elements given in Column I with the colour they impart to the flame given in Column II.
| Column I | Column II |
| (i) Cs | (a) Apple green |
| (ii) Na | (b) Violet |
| (iii) K | (c) Brick red |
| (iv) Ca | (d) Yellow |
| (v) Sr | (e) Crimson red |
| vi) Ba | (f) Blue |
\[\ce{NaOH}\] is manufactured by the electrolysis of brine solution. The products of the reaction are ______.
Which of the following metal hydroxides does not dissolve in sodium hydroxide solution?
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The pair of compounds which cannot exist together in solution is ______.
