Which of the following pairs of compounds is isomorphous?

$Assertion (A)$: White tin is an example of a tetragonal system. $Reasoning (R)$: For a tetragonal system, $a=b=c$ and $\alpha=\beta=\gamma \neq 90^{\circ}$. The correct answer is

The total number of Bravais lattice arrangements in different crystal systems is

The parameters of the unit cell of a substance are $a=2.5, b=3.0, c=4.0, \alpha=90^{\circ}, \beta=120^{\circ}, \gamma=90^{\circ}$. The crystal system of the substance is :

Which of the following crystal systems exists only as a primitive Bravais lattice?

For which of the following substances are the axial distances equal?