The process of caustification is used for the preparation of which of the following?

Which of the following properties is not true for an alkali metal?

What type of oxides do alkali metals form? Discuss some of the physical properties of these oxides.

Select the incorrect statement.

Assertion : $K$,$Rb$ and $Cs$ (all belonging to group $1$) can also form superoxides.
Reason : The ionic radii of $K$,$Rb$ and $Cs$ show the following trend $Cs^{+} < Rb^{+} < K^{+}$.

The major component/ingredient of Portland Cement is: