Embibe Experts Solutions for Chapter: The s - Block Elements (Alkali and Alkaline Earth Metals), Exercise 1: AP EAPCET - 20 Aug 2021 Forenoon

Assertion (A): $\mathrm{K}, \mathrm{Rb}$ and $\mathrm{Cs}$ form superoxides
Reason (R): The stability of superoxides increases form $\mathrm{K}$ to $\mathrm{Cs}$ due to decrease in lattice energy.

In the preparation of baking soda, ${\mathrm{H}}_2\mathrm{O}$ and ${\mathrm{CO}}_2$ in ratio is used to react with ${\mathrm{Na}}_2{\mathrm{CO}}_3$.

Potassium cyanide is made alkaline with $\mathrm{NaOH}$ and boiled with thiosulphate ions. The solution is cooled and acidified with $\mathrm{HCl}$ and this solution with iron $\left(\mathrm{III}\right)$chloride produces :-

Magnesium is burnt in the air to form $\mathrm{A}$ and $\mathrm{B}$. When $\mathrm{B}$ is hydrolyzed, $\mathrm{C}$ and $\mathrm{D}$ are formed. $\mathrm{D}$ is the reactant in the manufacture of nitric acid by Ostwald's process. What is $\mathrm{C}$ ?