In a tetragonal crystal system,which of the following conditions is correct?
- A$a = b \ne c, \alpha = \beta = \gamma = 90^\circ$
- B$\alpha = \beta = \gamma = 90^\circ, a = b \ne c$
- C$\alpha = \beta = \gamma = 90^\circ, a \ne b \ne c$
- D$\alpha = \beta = 90^\circ, \gamma = 120^\circ, a = b \ne c$
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| Column $I$ | Column $II$ |
| $(A)$ Simple cubic and face-centred cubic | $(p)$ have these cell parameters $a=b=c$ and $\alpha=\beta=\gamma=90^{\circ}$ |
| $(B)$ Cubic and rhombohedral | $(q)$ are two crystal systems |
| $(C)$ Cubic and tetragonal | $(r)$ have only two crystallography angles of $90^{\circ}$ |
| $(D)$ Hexagonal and monoclinic | $(s)$ belong to same crystal system |
DifficultIIT 2007
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