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151. Define the terms colloid and colloidal state. How does the theory of selective adsorption explain the origin of charge on colloidal particles?

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152. If solid is dispersed in a liquid, the colloid is termed _______ while if a liquid is dispersed in solid the colloid is termed _______.

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153. In an aerosol __________ is dispersed in ________.

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154. In foams,________ is dispersed in __________.

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155. The process of purifying a colloidal solution by placing it in a parchment bag kept in water is called _________.

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156. The effect making visible the colloidal particles under an ultramicroscope is called _________.

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157. Blood is a _______ charged sol.

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158. Arsenic sulphide sol carries a _________ charge.

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159. ______ Sols are irreversible.

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160. Milk is an example of _______.

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