MCQOPTIONS
Saved Bookmarks
| 1. |
The density of gold is 19 g/cm3 . If 1.9×10−4g 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 mm3 of the sol will be [Pb.CET 2004] |
| A. | 1.9×1012 |
| B. | 6.3×1014 |
| C. | 6.3×1010 |
| D. | 2.4×106 |
| Answer» E. | |