Hello,
Yes solid state is a part of the syllabus for JEE mains 2020. It is an integral part of the syllabus of jee mains.

Solid State: Classification of solids: molecular, ionic, covalent and metallic solids, amorphous and crystalline solids (elementary idea)

Braggs Law and its applications

Unit cell and lattices, packing in solids (fcc, bcc and hcp lattices), voids, calculations involving unit cell parameters, imperfection in solids

Electrical, magnetic and dielectric properties


For a detailed syllabus of jee mains please visit this link https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/jee-main-syllabus/amp&ved=2ahUKEwiyvOWhv_npAhUKzjgGHazZCSEQFjAMegQIAhAB&usg=AOvVaw3dJoT3-VcydpEQD8beQpzY&ampcf=1

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Hope it helps

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