wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Red ink is prepared from


A

Eosin

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B

Phenol

No worries! We‘ve got your back. Try BYJU‘S free classes today!
C

Aniline

No worries! We‘ve got your back. Try BYJU‘S free classes today!
D

Congo red

No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is A

Eosin


The explanation for the correct option:

Option (A): Eosin

  1. Dyes are organic compounds that are used to color paper, leather, and textiles.
  2. Red ink is the most widely used dye for staining cytoplasm in histology. The cytoplasm is the thick fluid that fills the cells.
  3. It is a brilliant pink dye substance with a complicated structure that is not found naturally but is manufactured from xanthene.
  4. Eosin, a sodium salt known as 2,4,5,7Tetrabromofluorescein.
  5. It is also employed as a red dye in inks however, the molecule, particularly eosin Y, degrades over time, leaving behind its bromine atoms, leading paint containing such a dye to have a darker brown color.

The explanation for the incorrect option:

Option (B): Phenol:

  1. The aromatic organic chemical phenol (also known as carbolic acid) has the molecular formulaC6H5OH. It is a flammable white crystalline substance.
  2. Its structure is given as
  3. A phenyl group (C6H5) is connected to a hydroxy group (OH) in this molecule. It's mildly acidic and should be handled with caution because it can cause chemical burns.
  4. It is largely utilized in the production of plastics and other products. Polycarbonates, epoxies, Bakelite, nylon, detergents, herbicides, and a variety of pharmaceutical medications all require phenol and its chemical derivatives.

Option (C): Aniline

  1. The organic compound aniline has the formulaC6H5NH2. Aniline is the simplest aromatic amine, consisting of a phenyl group connected to an amino group.
  2. Its structure is given as
  3. It is primarily used in the production of polyurethane, dyes, and other industrial chemicals as a precursor.

Option (D): Congo red

  1. Congo red is the first synthetic dyestuff of the direct kind, meaning it does not require the use of a mordant (a substance such as tannin or alum used to fix the color to cotton fibers).
  2. Its structure is given as
  3. It is an azo dye made from benzidine.
  4. It was once used to color cotton, but it has since been replaced by dyes that are lighter and wash-resistant. It is still used to stain tissues for microscopic examination and as an acid-base indicator in histology.
  5. It is not used to make red ink.

Therefore, Red ink is prepared from option (A) Eosin.


flag
Suggest Corrections
thumbs-up
1
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Uses of Alcohols
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon