Tag: chemistry

Antihistamines are drugs which treat allergic rhinitis and other allergies. Antihistamines can give relief when a person has nasal congestion, sneezing, or hives because of pollen, dust mites, or animal allergy. Typically people take antihistamines as an inexpensive, generic, over-the-counter drug with few side effects. As an alternative to taking an antihistamine, people who suffer from allergies can instead avoid the substance which irritates them. However, this is not always possible as some substances, such pollen, are carried in the air, thus making allergic reaction caused by them generally unavoidable.

Penicillin is effective only against Gram-positive bacteria because Gram-negative bacteria have a lipopolysaccharide and protein layer that surrounds the peptidoglycan layer of the cell wall, preventing penicillin from attacking.

Iproniazid (Marslid, Rivivol, Euphozid, Iprazid, Ipronid, Ipronin) is a non-selective, irreversible monoamine oxidase inhibitor (MAOI) of the hydrazine class. It is a xenobiotic that was originally designed to treat tuberculosis, but was later most prominently used as an antidepressany drug.

Azoic dyeing is a technique in which an insoluble Azo dye is produced directly onto or within the fiber. This is achieved by treating a fiber with both diazo and coupling components.
With suitable adjustment of dyebath conditions, the two components react
to produce the required insoluble azo dye. This technique of dyeing is unique, in that the final color is controlled by the choice of the diazoic and coupling components.
Hence option A is correct.

Reactive dyes utilize a chromophore attached to a substituent that is capable of directly reacting with the fiber substrate. The covalent bonds that attach the reactive dye to natural fibers make them among the most permanent of dyes. 'Cold' reactive dyes, such as Procion MX, Cibacron F, and Drimarene K, are very easy to use because the dye can be applied at room temperature. Reactive dyes are by far the best choice for dyeing cotton and other cellulose fibers at home or in the art studio.

Dispersed dyes were originally developed for the dyeing of cellulose acetate and are water-insoluble. The dyes are finely ground in the presence of a
dispersing agent and sold as a paste, or spray-dried and sold as a
powder. Their main use is to dye polyester but they can also be used to dye nylon.
Hence option C is correct.

The assertion that Penicillin (G) is an antihistamine is incorrect. Penicillin (G) is an antibiotic. It is a narrow spectrum antibiotic. Hence it effective against both gram positive as well as Gram negative bacteria. Therefore, the Reason is correct.
Hence, option E is the right answer.

A, B and C are natural fibres.