All four sides of a square are equal in length.

All four angles of a square are 90 degrees.

The diagonals of a square bisect each other at 45 degrees.

The diagonals of a square are equal in length.

La

Lu

Gd

Ce

Limonite

Siderite

Carnallite

Chalcopyrites

Al

Mg

Ag

Ca

$1.5\%$

$3.5\%$

$6.5\%$

$8.5\%$

${\rm{S}}{{\rm{O}}_3}$

${\rm{S}}{{\rm{O}}_2}$

${\rm{F}}{{\rm{e}}_2}{{\rm{O}}_3}$

All of these

${\rm{S}}{{\rm{O}}_3}$

${\rm{S}}{{\rm{O}}_2}$

${\rm{F}}{{\rm{e}}_2}{{\rm{O}}_3}$

All of these

NaOH

HCl

${{\rm{H}}_2}{\rm{S}}$

${\rm{NaN}}{{\rm{O}}_2}$

$p$-block elements

$s$-block elements

$d$-block elements

None of the above

Yb$^{3+}$

Tm$^{3+}$

Er$^{3+}$

None of these

The nature of the anion

The nature of the cation

The nature of both the ions

The nature of the solvent