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 ______.
पर्याय
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
Write a balanced equation for the reaction between KO2 and water.
Which one of the following alkali metals gives hydrated salts?
For alkali metals, which one of the following trends is incorrect?
Which of the following statements is incorrect?
What are the common physical features of alkali metals?
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?
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 heated in air, the alkali metals form various oxides. Mention the oxides formed by Li, Na and K.
The valence shell electronic configuration of alkali metals is ______.
Match List-I with List-II.
| List-I | List-II |
| (Metal) | (Emitted light wavelength (nm)) |
| (a) Li | (I) 780.0 |
| (b) Na | (II) 455.5 |
| (c) Rb | (III) 670.8 |
| (d) Cs | (IV) 589.2 |
Choose the most appropriate answer from the options given below:
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:
A white precipitate was formed when BaCl2 was added to extract of an inorganic salt. Farther, a gas 'X' with characteristic odour was released when the formed white precipitate was dissolved in dilute HCl. The anion present in the inorganic salt is ______.
The metal mainly used in devising photoelectric cells is ______.
The correct order of conductivity of ions in water is ______.
Alkali metals are powerful reducing agents because ______.
Which element from following is used as moderator in nuclear reactor?
