The correct answer is a) Titanium dioxide.
Titanium dioxide is a naturally occurring mineral that is found in many parts of the world, including Kerala. It is a white, odorless powder that is used in a variety of products, including paints, sunscreens, and cosmetics. Titanium dioxide is also used in the production of titanium metal.
Kerala’s black sands are known for their high concentration of titanium dioxide. The sand is mined from the beaches of Kerala and is then processed to extract the titanium dioxide. The titanium dioxide is then sold to companies that use it in their products.
The other options are incorrect because they are not found in high concentrations in Kerala’s black sands. Calcium carbonate is a white, chalky mineral that is found in limestone and marble. Silica is a hard, glassy mineral that is found in sand and quartz. Magnesium ore is a mineral that contains magnesium.
I hope this helps! Let me know if you have any other questions.