Question:
A certain compound $X$ imparts a golden yellow flame. When zinc powder is heated with concentrated solution of $X$, $H_2$ gas is evolved. $X$ combines with $CO_2$ to give a salt $Y$. $Y$ is a hydrated salt which on reaction with $HCl$ or excess of $CO_2$ gives another salt $Z$ which is an important part of baking powder. Identify $X$, $Y$ and $Z$.
A certain compound $X$ imparts a golden yellow flame. When zinc powder is heated with concentrated solution of $X$, $H_2$ gas is evolved. $X$ combines with $CO_2$ to give a salt $Y$. $Y$ is a hydrated salt which on reaction with $HCl$ or excess of $CO_2$ gives another salt $Z$ which is an important part of baking powder. Identify $X$, $Y$ and $Z$.
Updated On: Jul 5, 2022
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- b
- c
- d
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The Correct Option is A
Solution and Explanation
$ {Zn +}$ $\underset{\text{(X)}}{ {2NaOH}}$ $ { \to Na2ZnO2 +H2}$
$\underset{\text{(X)}}{ {2NaOH}}$ $\,+ \, {CO2 \to}$ $\underset{\text{(Y)}}{ {Na2CO3}} {\,+ H2O}$
$\underset{\text{(Y)}}{ {Na2CO3}\,+} {HCl \to}$ $\underset{\text{(Z)}}{ {NaHCO3}}\,+ {NaCl}$
$\underset{\text{(Y)}}{ {Na2CO3}}+\, {CO2 +H2O \to}$ $\underset{\text{(Z)}}{ {2NaHCO3}}$
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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.