Advertisements
Advertisements
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
Advertisements
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.
\[\ce{NH4HCO3 ->[Heat] NH3 + H2O + CO2}\]
\[\ce{\underset{Ammonium chloride}{2NH4Cl} + Ca(OH)2 -> \underset{Ammonia}{2NH3} + \underset{Calcium chloride}{CaCl2} + H2O}\]
APPEARS IN
संबंधित प्रश्न
Why are alkali metals not found in nature?
Explain why alkali and alkaline earth metals cannot be obtained by chemical reduction methods?
Which of the alkali metal is having least melting point?
For alkali metals, which one of the following trends is incorrect?
The alkali metals are low melting. Which of the following alkali metal is expected to melt if the room temperature rises to 30°C?
Alkali metals react with water vigorously to form hydroxides and dihydrogen. Which of the following alkali metals reacts with water least vigorously?
Metals form basic hydroxides. Which of the following metal hydroxide is the least basic?
By adding gypsum to cement
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.
When a metal of group 1 was dissolved in liquid ammonia, the following observations were obtained:
(i) Blue solution was obtained initially.
(ii) On concentrating the solution, blue colour changed to bronze colour.
How do you account for the blue colour of the solution? Give the name of the product formed on keeping the solution for some time.
The metal mainly used in devising photoelectric cells is ______.
Nitrogen combines with metals to form ______.
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 :
The correct order of conductivity of ions in water is ______.
KO2 (potassium super oxide) is used in oxygen cylinders in space and submarines because it ______.
