Platinum and silver are corroded by___________________?
Correct answer: B. None of these
- A. Caustic soda solution
- B. None of these
- C. Sulphuric acid (10%)
- D. Phosphoric acid
Explanation
Platinum is highly resistant to these dilute acids, while silver is not significantly attacked by 10% sulphuric acid under ordinary conditions. Silver is attacked by nitric acid and hot concentrated sulphuric acid, neither of which is listed.
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