A student breathes in and out through the tube P in the apparatus illustrated (i) Name a liquid in the test tubes, which would detect a difference in composition between inhaled and exhaled air. (ii) After a minute or two of breathing, how would the liquids in tubes A and B differ in appearance?

chemical properties are the characteristic of matter which can only be observed by changing the chemical identity of a sample like flammability reactivity and toxicity.

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.