# Which of the following is a non – crystalline solid?(A)- ${\text{CsCl}}$(B)- ${\text{NaCl}}$(C)- ${\text{Ca}}{{\text{F}}_{\text{2}}}$(D)- Glass

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Hint:. Non – crystalline solids are also known as amorphous solids, and among the above given options that solid is amorphous solid which is relatively weaker than other and gets break easily.

-In option (A) ${\text{CsCl}}$ is given, which is a crystalline solid because in it regular cubic arrangement of Cesium (${\text{Cs}}$) and chlorine (${\text{Cl}}$) is observed.
-In option (B) ${\text{NaCl}}$is given, which is a crystalline solid because in it regular face centered cubic arrangement of Sodium (${\text{Na}}$) and chlorine (${\text{Cl}}$) is observed.
-In option (C) ${\text{Ca}}{{\text{F}}_{\text{2}}}$ is given, which is a crystalline solid because in it regular face centered cubic arrangement of Calcium (${\text{Ca}}$) and Fluorine (${\text{F}}$) is observed.