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171. Fog is an example of colloidal system of
  • liquid dispersed in gas
  • gas dispersed in gas
  • solid dispersed in gas
  • solid dispersed in liquid


A.

liquid dispersed in gas
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172. Milk is a 
  • Fat dispersed in milk
  • Fat dispersed in water
  • Water dispersed in fat
  • Water dispersed in oil
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173. Smoke is an example of
  • Gas dispersed in liquid
  • Gas dispersed in solid
  • Solid dispersed in gas
  • Solid dispersed in solid
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174. The extrastability of lyophilic colloids is due to
  • Charge on their particles
  • A layer of medium of dispersion on their particles
  • The smaller size of their particles
  • The larger size of their particles
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175. Lyophilic sols are more stable than lyophobic sols because
  • The colloidal particles have positive charge
  • The colloidal particles have negative charge
  • The colloidal particles are solvated
  • There are strong electrostatic repulsions between the negatively charged colloidal particles.
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176. Which one of the following is a hydrophobic sol?
  • Starch solution
  • Gum solution
  • Protein solution
  • Arsenic sulphide solution
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177. Which one of the following is not a colloid?
  • Milk
  • Blood
  • Ice-cream
  • Urea solution
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178. When excess of electrolyte is added to a colloid, it
  • coagulates
  • stabilises
  • gets diluted
  • does not change
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179. Which of the following will have the highest coagulating power for As2S3 colloid?
  • PO43–
  • SO42–
  • Al3+
  • Na+
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180. Tyndall effect in colloidal solution is due to
  • Scattering of light
  • Reflection of light
  • Absorption of light
  • Presence of electrically charged particles
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