According to mohs hardness scale, which of these groups of minerals can scratch fluorite? \

B.  Calcite, quartz, and topaz

C. Apatite, orthoclase, and corundum

D.  Diamond, gypsum, and quartz

 ANSWER

According to the Moh's hardness scale, the group of minerals that can scratch flourite are: APATITE, ORTHOCLASE AND CORUNDUM. The correct option is C. Moh's hardness scale is used to measure the resistance of a smooth surface to scratching. The scale ranges from 1 to 10, with talc having the hardness of 1, which is the softest and diamond having the value of 10, which is the hardest. All the three minerals listed in option C are above flourite in form of hardness so they can scratch fluorite.

oceans

indian ocean

pacific ocean

atlantic ocean

arctic ocean

southern ocean

a) carbon, hydrogen

b) carbon, hydrogen, oxygen, nitrogen

c) carbon, hydrogen, oxygen, nitrogen, phosphorus

d) sugar

e) amino acid

f) nucleotide