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प्रश्न
In the synthesis of sodium carbonate, the recovery of ammonia is done by treating NH4Cl with Ca(OH)2. The by-product obtained in this process is ______.
विकल्प
CaCl2
NaCl
NaOH
NaHCO3
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उत्तर
In the synthesis of sodium carbonate, the recovery of ammonia is done by treating NH4Cl with Ca(OH)2. The by-product obtained in this process is CaCl2.
Explanation:
Sodium carbonate is synthesised by Solvay or ammonia soda process. The reactions involved are
\[\ce{NH3 + H2O + CO2 -> \underset{Ammonium bicarbonate}{NH4HCO3}}\]
\[\ce{NaCl + NH4HCO3 -> \underset{Sodium bicarbonate}{NaHCO3} ↓ + NH4Cl}\]
\[\ce{2NaHCO3 ->[Δ] \underset{Sodium carbonate}{Na2CO3} + H2O +CO2 }\]
NH3 is recovered from NH4HCO3 and NH4Cl formed during the reaction.
\[\ce{NH4HCO3 ->[Heat] NH3 + H2O + CO2}\]
\[\ce{\underset{Ammonium chloride}{2NH4Cl} + Ca(OH)2 -> \underset{Ammonia}{2NH3} + \underset{Calcium chloride}{CaCl2} + H2O}\]
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संबंधित प्रश्न
What are the common chemical features of alkali metals?
Explain why alkali and alkaline earth metals cannot be obtained by chemical reduction methods?
When an alkali metal dissolves in liquid ammonia the solution can acquire different colours. Explain the reasons for this type of colour change.
Why are lithium salts commonly hydrated and those of the other alkali metal ions usually anhydrous?
Write a balanced equation for the reaction between Na2O and CO2.
Which of the alkali metal is having least melting point?
Which one of the following alkali metals gives hydrated salts?
Which of the following statements is incorrect?
Which of the following elements does not form hydride by direct heating with dihydrogen?
Metallic elements are described by their standard electrode potential, fusion enthalpy, atomic size, etc. The alkali metals are characterised by which of the following properties?
(i) High boiling point.
(ii) High negative standard electrode potential.
(iii) High density.
(iv) Large atomic size.
Which of the following compounds are readily soluble in water?
(i) BeSO4
(ii) MgSO4
(iii) BaSO4
(iv) SrSO4
Ions of an element of group 1 participate in the transmission of nerve signals and transport of sugars and aminoacids into cells. This element imparts yellow colour to the flame in flame test and forms an oxide and a peroxide with oxygen. Identify the element and write chemical reaction to show the formation of its peroxide. Why does the element impart colour to the flame?
The valence shell electronic configuration of alkali metals is ______.
Match List-I with List-II.
| List-I | List-II |
| (Metal) | (Application) |
| (a) Cs | (I) High temperature thermometer |
| (b) Ga | (II) Water repellent sprays |
| (c) B | (III) Photoelectric cells |
| (d) Si | (IV) Bullet proof vest |
Choose the most appropriate answer from the options given below:
The correct order of hydration enthapies of alkali metal ions is ______.
Given below are two statements, one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Lithium salts are hydrated.
Reason (R) : Lithium has higher polarising power than other alkali metal group members.
In the light of the above statements, choose the most appropriate answer from the options given below :
Alkali metals are powerful reducing agents because ______.
