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.
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What was the capital of the ancient Pandya Kingdom?
Which dynasty did the Shishunaga dynasty follow in ruling Magadha?
__________ was the mother of Mahavira.
Which vow is not among the Five Great Vows of Jainism?
The Battle of Chausa was fought between which two historical figures?
Which ruler's predecessor was Jalaluddin Khalji in the Delhi Sultanate?
Which historical monument in Agra is also a UNESCO World Heritage Site?
Where is the ancient Harappan site of Lothal situated?
Consider the followingstatements:
1. Charvaka was the main expounder of this philosophy
2. The philosophy is materialistic in nature
