Historical chapter — outside the current JEE Main unit list. These older questions remain available for reference.
Appeared 42 times across 19 years of JEE Main papers — about 2.2 questions a year. Every one of them is below, with a full worked solution.
We have the frequency data for Solid State but haven’t run its papers through the pipeline yet. The 42 questions above are counted from official answer keys; the worked solutions follow once each one clears verification.