Which of the following statements are true for crystalline solids
1) Crystalline solids have sharp melting points

          2) Crystalline solids have uniform chemical composition

          3) Crystalline solids are anisotropic

          4) Their physical properties depend upon direction

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2, 3 are correct

1, 2, 3, 4 are correct

3, 4 are correct

1, 2 are correct

answer is D.

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Detailed Solution

1. Crystalline solids have sharp melting points i.e., on heating all the bonds get ruptured suddenly at a fixed temperature

2. Crystalline solids have uniform chemical composition i.e., bonds between all the atoms and molecules are of equal strength

3. Crystalline solids are anisotropic i.e. physical properties depend on direction. It means they have different values in different direction.

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