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 ?
Correct answer: C. Both A. & B.
- A. Ammonium alum
- B. Potassium alum
- C. Both A. & B.
- D. Neither A. nor B.
Explanation
Alum salts destabilise the rubber colloid by neutralising charges and promoting coagulation, so both ammonium alum and potassium alum can be used. The coagulated rubber is then separated from the serum and processed.
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