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Select the correct statement regarding colloids and catalysis: (A) Acid-catalyzed hydrolysis of ethyl acetate (CH3COOC2H5) is an example of homogeneous catalysis. (B) The benzyl isomer is valid on all planes of polarized bonds. (C) Gemstone is an example of a solid sol. (D) Emulsion is an example of a sol.

1. Acid-catalyzed hydrolysis of CH3COOC2H5 is an example of homogeneous catalysis
2. The benzyl isomer is valid on all planes of polarized bonds
3. Gemstone is an example of a solid sol
4. Emulsion is an example of a sol

Correct answer: Acid-catalyzed hydrolysis of CH3COOC2H5 is an example of homogeneous catalysis

Solution

Acid-catalyzed hydrolysis of ethyl acetate takes place in aqueous solution where H+ ions act as catalyst — all reactants and catalyst are in the same (liquid) phase, making it homogeneous catalysis. Emulsions are liquid-in-liquid colloids, not sols (sol = solid dispersed in liquid). Gemstones are not sols.

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