In terms of diameter, ultrafine particles are sized between:
A
100 and 2500 nanometers
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B
10 and 2500 nanometers
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C
1 and 2500 nanometers
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D
100 and 250 nanometers
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Solution
The correct option is A 100 and 2500 nanometers In terms of diameter, fine particles cover a range between 100 and 2500 nanometers, while ultrafine particles are sized between 1 and 100 nanometers. Despite being the size of the ultrafine particles in individual molecules are usually not referred to as nanoparticles. Hence option A is correct.