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The density of gold is 19g//cm^3. If 1.9...

The density of gold is `19g//cm^3`. If `1.9xx10^-4`g of gold is dispersed in one litre of water to give a sol having spherical gold particles of radius 10 nm then the number of gold particles per `mm^3` of the sol will be:

A

`1.9xx10^12`

B

`6.3xx10^14`

C

`6.3xx10^10`

D

`2.4xx10^6`

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