| Colloidal solution | Gold number |
| A | 0.01 |
| B | 2.5 |
| C | 20 |
A) \[C>B>A\]
B) \[A>B>C\]
C) \[A=B=C\]
D) \[B>A>C\]
Correct Answer: B
Solution :
Smaller the value of the gold number, greater will be protecting power of the protective colloid. Hence, protective nature of A, B and C is as: Colloidal solution \[A\text{ }\,\,\,\,\,>\,\,\,\,\,\text{ }B\,\,\,\,\text{ }>\text{ }\,\,\,C\] Gold number: 0.01 2.5 20
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