Write down the changes that will be seen in the following instance and explain the reason behind it.

Magnesium oxide was added to dilute $\mathrm{HCl}$ and magnesium oxide was a added to dilute $\mathrm{NaOH}$.

Write down the changes that will be seen in each instance and explain the reason behind it.

Zinc oxide was added to dilute $\mathrm{HCl}$ and zinc oxide was added to dilute $\mathrm{NaOH}$.

Write down the changes that will be seen when dilute $\mathrm{HCl}$ was added to limestone and explain the reason behind it.

Write down the changes that will be seen and explain the reason behind it, when pieces of blue vitriol were heated in a test tube. On cooling, water was added to it.

Write down the changes that will be seen, explain the reason behind when dilute ${\mathrm{H}}_2{\mathrm{SO}}_4$ was taken in an electrolytic cell and electric current was passed through it.

Classify the following oxides into three types and name the types.

$\mathrm{CaO}, \mathrm{MgO}, {\mathrm{CO}}_2, {\mathrm{SO}}_3, {\mathrm{Na}}_2\mathrm{O}, \mathrm{ZnO}, {\mathrm{AI}}_2{\mathrm{O}}_3, {\mathrm{Fe}}_2{\mathrm{O}}_3$

Explain by drawing a figure of the electronic configuration of formation of sodium chloride from sodium and chlorine.

Explain by drawing a figure of the electronic configuration.

Formation of a magnesium chloride from magnesium and chlorine.

Show the dissociation of the hydrochloric acid on dissolving in water, with the help of chemical equation and write whether the proportion of dissociation is small or large.