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A colloidal system has particles of which of the following size?
(a) \( 10^{-9} \mathrm{~m} \) to \( 10^{-12} \mathrm{~m} \)
(b) \( 10^{-6} \mathrm{~m} \) to \( 10^{-9} \mathrm{~m} \)
\( \mathrm{P} \)
(c) \( 10^{-4} \mathrm{~m} \) to \( 10^{-10} \mathrm{~m} \)
(d) \( 10^{-5} \mathrm{~m} \) to \( 10^{-7} \mathrm{~m} \)
W
(1996)
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