Medium
If gold number of $A$,$B$,$C$ and $D$ are $0.005$,$0.05$,$0.5$ and $5$ respectively,then which of the following will have the highest protective power?
- A$A$
- B$B$
- C$C$
- D$D$
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The correct answer is:
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|---|---|
| $A$. $As_2S_3$ | $IV$. Double decomposition |
| $B$. $Au$ | $I$. Bredig's arc method |
| $C$. $S$ | $II$. Oxidation |
| $D$. $Fe(OH)_3$ | $III$. Hydrolysis |
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