Adistillation column separates 16,000 kg/h of a 70% benzene and 30% toluene. the product recovered from the top contains 95% benzene while the bottom product contains 96% toluene. the stream entering the condenser from the top of the column is 8,000 kg/h. a portion of the product is returned to the column as reflux and the remaining is withdrawn as top product. find the ratio of the amount refluxed to the product taken out.

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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.

the answers are

c and c