The element with atomic number $55$ belongs to which block of the periodic table?

Which of the following statements is incorrect?

Which of the following elements forms a superoxide when it reacts with oxygen?

What is the primary purpose of the Dow's process?

The correct order of electrical conductivity of alkali metal ions in their aqueous solution for $Cs^{+}$, $K^{+}$, $Na^{+}$, and $Li^{+}$ is:

Match column $-I$ with column $-II$ :

Column $-I$	Column $-II$
$(a).$ Spodumene	$(p).$ $K$
$(b).$ Borax	$(q).$ $Na$
$(c).$ Sylvine	$(r).$ $Li$
$(d).$ Chile saltpetre	$(s).$ $Ca$