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Q. The crystal system having the highest and the lowest symmetrises respectively, are

NTA AbhyasNTA Abhyas 2020The Solid State

Solution:

The crystal system having the highest and the lowest symmetrises respectively, are cubic and triclinic.
Cubic $\rightarrow$ Most symmetrical $( a = b =$ c, $\alpha=\beta=\gamma=90^{\circ}$ )
Triclinic $\rightarrow$ Least symmetrical ( $a \neq$ $\left.b \neq c, \alpha \neq \beta \neq \gamma \neq 90^{\circ}\right)$