(B) major chemical properties of noble metal is the most important common chemical stability (chemically inert), which is mainly manifested in two aspects - aspects of acid, alkali corrosion and oxidation. A comparison of the corrosion resistance of commonly used chemical reagents is shown in Table 2.
Table 2 Â Comparison of Corrosion Resistance of Precious Metals to Some Chemical Reagents | ||||||||
Reagents and conditions | Au | Ag | Pt | Pd | Rh | Ir | Os | Ru |
H 2 SO 4 | concentrated | A | B | A | A | A | A | A |
HNO 3 | 0.1mol/L | A | B | A | A | A | A |
|
　 | 70% | A | 　 | A | D | A | 　 | C |
　 | 70%10 0°C | A | D | A | D | A | A | D |
Wang Shui | Room temperature | D | D | D | D | A | A | D |
　 | boiled | D | D | D | D | A | A | D |
HCl | 36% room temperature | A | B | A | A | A | A | A |
　 | 36% boiled | A | D | B | B | A | A | C |
Cl2 | dry | B | 　 | B | C | A | A | A |
　 | wet | B | 　 | B | D | A | A | C |
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