Question:
A chemical $'A?$ is used for the preparation of washing soda to recover ammonia. When $CO_2$ is bubbled through an aqueous solution of $'A?$, the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of $'A'$ ?
A chemical $'A?$ is used for the preparation of washing soda to recover ammonia. When $CO_2$ is bubbled through an aqueous solution of $'A?$, the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of $'A'$ ?
Updated On: Jul 5, 2022
- $Ca(HCO_3)_2$
- $CaO$
- $Ca(OH)_2$
- $CaCO_3$
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The Correct Option is C
Solution and Explanation
$Ca(OH)_2$ is used in Solvay process i.e., preparation of washing soda $(Na_2CO_3 \cdot 10H_2O)$ to recover $NH_3$.
$ {2NH4Cl}\,+$ $\underset{\text{$'A'$}}{ {Ca(OH)2} \to} {2NH3 + CaCl2 + H2O}$
$\underset{\text{$'A'$}}{ {Ca(OH)2}} + {CO2 \to}$ $\underset{\text{Milkincss}}{ {CaCO3 v}} {+ H2O}$
$Ca(OH)_2$ is used in white washing due to its disinfectant nature.
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Concepts Used:
Group 1 Elements
Group one of alkali metals is s-block elements with just one electron in their s-orbital. They are are alkali metals. They are named so because of the alkaline nature of the hydroxides and oxides.
Alkali metals are characterized by one s-electron in the valence shell of their atoms.
Alkali metals have a corresponding [Noble gas] ns1 electronic configuration. They occupy the first column of the periodic table. Alkali elements are:
- Lithium(Li)
- Sodium(Na)
- Potassium (K)
- Rubidium (Ru)
- Cesium (Cs)
- Francium (Fr)
They have occupied successive periods from first to seven. Francium is a radioactive element with very low half-life.
Electronic Configuration:
- Alkali metals have one electron in their valence shell.
- The electronic configuration is given by ns1. For example, the electronic configuration of lithium is given by 1ns1 2ns1.
- They tend to lose the outer shell electron to form cations with charge +1 (monovalent ions).
This makes them the most electropositive elements and due to the same reason, they are not found in the pure state.