Which one is called pseudo solid ? (a) \( \mathrm{CaF}_{2} \) (b) Glass (c) \( \mathrm{NaCl} \)

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Which one is called pseudo solid ?
(a) \( \mathrm{CaF}_{2} \)
(b) Glass
(c) \( \mathrm{NaCl} \)
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