Which of the following comparisons is incorrect? a. talc is softer than gypsum. b. feldspar is harder than calcite. c. quartz is softer than corundum. d. apatite is harder than topaz.

Option (d) is the correct answer.

Explanation:

Mohs scale is used to classify minerals on the basis of their hardness. This scale includes 10 minerals. The hardness of each of the minerals is as follows.

Therefore, more is the number given to a mineral, more will be its hardness.

Thus, we can conclude that out of the given options the comparison Apatite is harder than topaz is incorrect because Apatite is softer than topaz according to Mohs scale.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.

with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence