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What is protective colloid ?...

What is protective colloid ?

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Lyophilic colloids used for the prevention of coagulation of lyophobic colloids are called protective colloids.
`to` Lyophilic colloids protect the lyophobic colloids.
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Gold numbers of four protective colloids A, B, C and Dare 0.5, 0.01,0.1 and 0.005 respectively. Arrange them in the correct order of their protective power.