A) \[{{10}^{-5}}-{{10}^{-7}}cm\]
B) \[{{10}^{-7}}-{{10}^{-9}}cm\]
C) \[{{10}^{-3}}-{{10}^{-5}}cm\]
D) \[{{10}^{-2}}-{{10}^{-6}}cm\]
Correct Answer: A
Solution :
The size of colloidal particles usually lie in range of one nm to 100 nm. i.e., \[{{10}^{-5}}\] to \[{{10}^{-7}}cm\] or 1 nm = \[{{10}^{-7}}cm\] \[\therefore \,\,100\text{ }nm={{10}^{-5}}\,cm\]
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