Two unknown household items are being tested with litmus paper. Substance A turns red litmus paper blue and Substance B turns blue litmus paper red. Which of the following best explains the results of the experiment?
a. Substance A is an acid and Substance B is a base.
b. Substance A is a base and Substance B is an acid.
c. Both Substances A and B are acids.
d. Both Substances A and B are bases.

gold is my favorite solid.

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.