Which of the following is a nonmetallic mineral resource? . a. wood . b. iron . c. coal . d. aggregate

The correct option is D.

Explanation: Nonmetallic minerals are the chemical elements from which no new product can be formed when they are melted. For Example: Sand, marble etc..

For the given options:

Option A: Wood is a type of cellulose and is not considered as a nonmetallic mineral resource.

Option B: Iron is an element because it is the smallest substance which cannot be broken down. It is not considered as a nonmetallic mineral resource.

Option C: Coal is a mixture of carbon compounds. This is very close to mineral but is an organic mineral because it contains carbon atom. Hence, it is not considered as a nonmetallic mineral resource.

Option D: Aggregate is  formed by the collection of particles forming a whole mass. This is a non-metallic resource as it cannot form any new product.

Hence, the correct option is D.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.