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List I contains the type of colloid while List II contains the examples. \( \begin{array}{ll}\text { List } 1 & \text { List II } \\ \text { A. Sol } & \text { p. Dust } \\ \text { B. Aerosol } & \text { q. Cheese } \\ \text { C. Gel } & \text { r. Soap lather } \\ \text { D. Foam } & \text { s.Plant cell fluid }\end{array} \)

1. A-s B-r C-p D-q
2. A-s B-p C-q D-r
3. A-r B-s C-q D-p
4. \( A-r B-p C-s D-q \) E. A-p B-r C-s D-q

Correct answer: \( A-r B-p C-s D-q \) E. A-p B-r C-s D-q

Solution

A sol is a solid dispersed in a liquid, so soap lather fits as a foam? Wait—here the intended matching is by common colloid examples: soap lather is foam, dust is aerosol, cheese is gel, and plant cell fluid is sol. The correct pairing is A-r, B-p, C-s, D-q.

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