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Which of the following statements about colloids and catalysis is correct?

1. Acid catalysed hydrolysis of CH3COOC2H5 is an example of heterogeneous catalysis.
2. Freundlich isotherm is valid at all pressures of adsorbing gases.
3. Gem stone is an example of solid sol.
4. Pumice stone is an example of sol.

Correct answer: Gem stone is an example of solid sol.

Solution

Acid-catalysed ester hydrolysis occurs in homogeneous aqueous solution (same phase), not heterogeneous. The Freundlich isotherm fails at very high pressures. Pumice stone is a solid foam (gas dispersed in solid), not a sol. Gem stones are solid sols: trace coloured species (solid) dispersed in a solid crystal lattice.

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