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[" The density of gold is "19g/cm^(3)" ....

[" The density of gold is "19g/cm^(3)" .If "1.0times10^(-4)g" of gold is dispersed in "1L" of water to give a sol having "],[" spherical gold particles of radius "10nm" ,then the number of gold particles per "mm^(3)" of the sol will be: "]

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