Q. On Moh's scale, materials with hardness number less than 4 are (Solved)

1. Topaz, Corundum, Diamond

2. Hardened and tempered

3. Felspar, corundum, Diamond

4. Fluorite, Felsper, Talc

5. Talc, gypsum, calcite

  • e. Talc, gypsum, calcite
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