Primitive Triclinic

Rhombohedral

Base-Centered Orthorhombic

Body-Centered Tetragonal

Silica

Silicon

Silicon carbide

Sodium silicate

9 plane of symmetry

13 axis of symmetry

1 centre of symmetry

All of these

$a$

$\frac{a}{2}$

$\frac{{2a}}{{\sqrt 3 }}$

$\frac{{\sqrt 3 }}{2}a$

$0.6708\;{\rm{g}}\;{\rm{ c}}{{\rm{m}}^{ - 3}}$

$1.6708\;{\rm{g }}\;{\rm{c}}{{\rm{m}}^{ - 3}}$

$2.6708\;{\rm{g }}\;{\rm{c}}{{\rm{m}}^{ - 3}}$

None of these

Hexagonal

Orthorhombic

Cubic

Triclinic

$189.37{\rm{ }}pm$

$209.87{\rm{ }}pm$

$219.25{\rm{ }}pm$

$235.16{\rm{ }}pm$

Solid $C{O_2}$

Silica

Iodine crystal

White phosphorus

$a = b = c$; $\alpha = \beta = \gamma = 90^\circ$

$a

eq b

eq c$;$\alpha = \beta = \gamma = 90^\circ$

$a = b

eq c$;$\alpha = \beta = 90^\circ$,$\gamma = 120^\circ$

$a

eq b

eq c$;$\alpha

eq \beta

eq \gamma

eq 90^\circ$

All sides of a square are equal.

All angles of a square are 90 degrees.

The diagonals of a square are perpendicular bisectors of each other.

The diagonals of a square are not equal in length.

Presence of electrons in the crystal lattice

Presence of ${\rm{N}}{{\rm{a}}^ + }$ ions in the crystal lattice

Presence of ${\rm{C}}{{\rm{I}}^ - }$ ions in the crystal lattice

Presence of face centred cubic crystal lattice