Bissoy.com
Doctors Medicines MCQs Q&A

Which substance is added to the dilute latex to prevent darkening of latex?

Which substance is added to the dilute latex to prevent darkening of latex? Correct Answer sodium bisulfite

A little amount of sodium bisulfite is added to the dilute latex before tapping to prevent darkening or discoloration of the latex which may otherwise develop as a consequence of an enzymatic reaction in the latex involving its phenolic constituents producing the dark coloured pigment melanin.

Related Questions

In the following question, sentences of a paragraph have been jumbled and labelled as A, B, C and D. You are required to rearrange the jumbled sentences of the paragraph and mark your response accordingly by selecting the correct option. A: In major areas, latex is allowed to coagulate in the collection cup, then they are collected and processed into dry forms for marketing. B: The latex then is refined into rubber that is ready for commercial processing. C: The latex is a sticky, milky colloid drawn off by making incisions in the bark and collecting the fluid in vessels in a process called "tapping". D: Rubber is harvested mainly in the form of the latex from the rubber tree or others.
Reaction between which of the following will NOT lead to the evolution of Hydrogen gas? (A) Magnesium with dilute hydrochloric acid (B) Copper with dilute hydrochloric acid (C) Sulphur powder with dilute hydrochloric acid (D) Aluminium with dilute hydrochloric acid
A dilute solution of sodium carbonate was added to two test tubes one containing dilute HCI (A) and the other containing dilute NaOH (B). the correct observation was:
Which of the following is the correct definition of mole? (A) It is equal to the gram atomic mass of the substance (B) It contains 6.022 × 1020 atoms of the given substance (C) It is equal to the gram molecular weight of the substance (D) It contains 6.022 × 1023 molecules of the given substance
Which of the following statement is correct? Statement 1: The addition of hydrogen to a substance and the removal of the oxygen from a substance is called oxidation. Statement 2: The addition of oxygen in a substance and the removal of  Hydrogen from a substance is called reduction.  
Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex?
The latex cells differ from the latex vessels in that
A strip of cupric acid paper, freshly moistened with a dilute solution of benzidine in dilute acetic acid is held in the pyrolytic vapours of polymer A and a bright blue colouration is obtained. Which of the following could be polymer A?
Consider the following statements.
1. During the pressure of osmosis, the solvent travels from the concentrated solution to the dilute solution.
2. In the reverse osmosis, external pressure is applied to the dilute solution.
Which of the statement(s) given above is/are correct?
Assertion (A) In osmosis, solvent molecules pass through a semipermeable membrane from a more dilute solution to a more concentrated one, when these two are separated by the semi-permeable membrane.
Reason (R) The vapour pressure of the solvent over the dilute solution is less than that over the concentrated solution.