MCQ
By annealing, steel
- ✓Becomes soft
- BBecomes liquid
- CBecomes hard and brittle
- DIs covered with a thin film of $F{e_3}{O_4}$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

(Given atomic number: $\mathrm{C}: 6, \mathrm{Na}: 11, \mathrm{O}: 8$, $\mathrm{Fe}: 26, \mathrm{Cr}: 24 \mathrm{~J}$