2016 · Q34
Arrange the following substances in their order of increasing hardness:
- 1Gypsum,
- 2Topaz,
- 3Fluorite,
- 4Feldspar.
Select the correct answer using the code given below:
general-sciencechemistry
- A4-3-2-1
- B1-3-4-2
- C3-4-2-1
- D1-4-3-2
Explanation
On Mohs scale, gypsum has hardness 2, fluorite 4, feldspar 6, and topaz 8. Arranged in increasing hardness: gypsum (1), fluorite (3), feldspar (4), topaz (2). The code 1-3-4-2 matches option (B).