Assertion :Amorphous solids are isotropic. Reason: Amorphous solids lack a regular three-dimensional arrangement of atoms.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Amorphous solids (such as glass) lack a regular three-dimensional arrangement of atoms. Solids are most stable in crystalline form.
However, if a solid is formed rapidly (for example, when a liquid is cooled suddenly), its atoms or molecules do not have time to allign themselves and may become locked in positions other than those of a regular crystal. Such resulting solids are called amorphous solids which have diffused melting point.
Also, amorphous solids are isotropic (like liquids and gases). Isotropic means the value of any physical property (like refractive index, conductivity etc.) measured in different directions is same since they are homogeneous.

Hence,option A is correct.

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