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Select the correct statements. (A) Crystalline solids have long range order. (B) Crystalline solids are isotropic. (C) Amorphous solid are sometimes called pseudo solids. (D) Amorphous solids soften over a range of temperatures. (E) Amorphous solids have a definite heat of fusion. Choose the most appropriate answer from the options given below.

1. (A), (B), (E) only
2. (B), (D) only
3. (C), (D) only
4. (A), (C), (D) only

Correct answer: (A), (C), (D) only

Solution

Option (A) is correct because crystalline solids exhibit a well-defined, repeating structure that extends throughout the material, indicating long-range order. Option (C) is accurate as amorphous solids lack a long-range order and are often referred to as pseudo solids due to their non-crystalline nature. Option (D) is also true since amorphous solids do not have a sharp melting point and instead soften gradually over a range of temperatures.

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