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Start learning 50% faster. Sign in nowMost 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.
Autocidal pest management refers to
Which one the following element largely influence calcium metabolism in plants?
Match the following:
What is the function of potassium in plants?
________ farming is an excellent illustration of sustainable agriculture.
Match the following:
What is the term for the practice of growing grass or legumes in rotation with grain or tilled crops as a soil conservation measure?
Who has become the first women Director General of World Trade Organization?
Reagents required for determination of soil organic matter in laboratory.
A. Potassium dichromate
B. Ferrous ammonium sulphate
C. S...
which among the following is a Entomopathogenic fungi:
