Which of the following is an indicator of a chemical reaction? A. changing states of matter(solid/liquid)
B. increasing in temperature.
C. two different compounds mixing and remaining separate.
D. decreasing in size. ​

B

Explanation:

B is the best showing of a chemical reaction out of the choices

it is all except C

Explanation:

a chemical reaction occurs when 2 substances completely mix together and they do not remain separate

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.