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Polymers — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryPolymers1 Mark
MCQ
Vulcanisation makes rubber $.......$
$a.$ More elastic.
$b.$ Soluble in inorganic solvent.
$c.$ Crystalline.
$d.$ More stiff.
  • A
    $a$ and $b$
  • B
    $a$ and $c$
  • C
    $b$ and $c$
  • ✓
    $a$ and $d$
✓

Answer

Correct option: D.
$a$ and $d$
To improve upon physical properties of natural rubber a process of vulcanisation is carried out. This process consists of heating a mixture of raw rubber with sulphur and an appropriate additive at a temperature range between $373K$ to $415K.$ On vulcanisation, sulphur forms cross links at the reactive sites of double bonds and thus the rubber gets stiffened.

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