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प्रश्न
Give reasons for the following observations: Leather gets hardened after tanning.
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उत्तर
Animal skin (hide) is colloidal in nature and has positively charged particles, whereas tanning consists of negatively charged colloidal particles. When a hide is soaked in tanning, mutual coagulation takes place and as a result, leather gets hardened.
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संबंधित प्रश्न
Define the following terms: Associated colloids
Explain the terms Dialysis
Which of the following will show Tyndall effect?
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(i) Lyophobic sol is protected.
(ii) Lyophilic sol is protected.
(iii) Film of lyophilic sol is formed over lyophobic sol.
(iv) Film of lyophobic sol is formed over lyophilic sol.
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Reason: Pore size of the filter paper becomes more than the size of colloidal particle.
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Reason: Colloidal particles are large in size.
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