Embibe Experts Solutions for Chapter: The s-block Elements, Exercise 2: Level 2

Alkali metal $\left(\mathrm{M}\right)$ dissolves in liquid ${\mathrm{NH}}_3$ to give:

The correct order of energy of $2\mathrm{s}$ orbitals in $\mathrm{H}, \mathrm{Li}, \mathrm{Na}$ and $\mathrm{K}$ is

The thermal stability of alkaline earth metal carbonates $-{\mathrm{MgCO}}_3, {\mathrm{CaCO}}_3, {\mathrm{SrCO}}_3$ and ${\mathrm{BaCO}}_3$, follows the order:

Which of the following compounds, on reaction with $\mathrm{NaOH}$ and ${\mathrm{Na}}_2{\mathrm{O}}_2$, gives yellow colour solution?

Aqueous solution of potash alum is:

Which mixed sulphate is not an alum:

The metal that shows photoelectric emission at lowest frequency radiation is:
 

Write atomic number difference between $1^{\mathrm{st}}$ alkali metal and alkaline earth metal of $3^{\mathrm{rd}}$period of periodic table.