Question

which one of the following is obtained from Coal Tar? a. petrol b. coke c. air d. naphthalene balls​

Answer 1

Answer:

Naphthalene Balls

is the right answer.

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Answer 2

Answer:

Naphthalene balls

Explanation:

Small mothballs made of chemical insecticide and deodorant are sometimes used to store garments and other items that could get mould or moth larvae harm (especially clothes moths like Tineola bisselliella). Because of naphthalene's flammability, many modern mothball formulations now use 1,4-dichlorobenzene instead of the naphthalene that made up older mothballs. Although both substances have the same NFPA 704 flammability rating, the latter formulation may be a little less flammable. The latter substance is also variously referred to as para-dichlorobenzene, p-dichlorobenzene, pDCB, or PDB, making it more difficult to distinguish unless all of these acronyms are known to a possible buyer. Both of these compositions have the characteristically potent, sickly-sweet, and overpowering smell of mothballs. Naphthalene and 1,4-dichlorobenzene both go via sublimation, which is a direct transition from a solid state.

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