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Most naphthalene is derived from coal tar. Typical coal tar is about 10% naphthalene by weight. Naphthalene in crystallized from coal tar fraction with boiling point 210-220°C than it is washed with sulphuric acid solution to remove theophany, with diluted alkali to remove phenol and, finally, is distilled. Also naphthalene is produced from heavy petroleum fractions during petroleum refining, but today petroleum-derived naphthalene represents only a minor component of production . Coal tar is brown or black liquid of extremely high viscosity. In the coal gas era, there were many companies in Britain whose business was distil coal tar to separate the higher-value fractions, such as naphtha, creosote and pitch.
In each of the following questions, two columns are given containing three sentences/ phrases each. A sentence or phrase from the first column may or m...
In the following question, match the statement from column 1 with column 2 and find which of the following pair of statements given in the options make...
COLUMN A COLUMN B
A) the country is still fighting with the battle D) profoundly affects the risk of breast against cancer
B) Among the...
Directions: Choose the combination that completes the sentences.
In the following questions, two columns are given, Column 1 and Column 2. Each column contains 3 phrases. Match the phrases in Column 1 with the phrase...
. COLUMN A COLUMN B
A)Transgressions must be sanctioned D)to Rwanda was a defining moment.
B)The 1996 Joint Evaluation of Emergency Assi...
Column (1) | Match Column I and Column II and choose the correct match from the given choice
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