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Which of the following statements is/are true about titanium?

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Which of the following statements is/are true about titanium?

(a) It has excellent corrosion resistance to fuming nitric acid

(b) It is used as an oxidizer in fuel systems for rockets

(c) It has excellent corrosion resistance to fuming nitric acid and it is used as an oxidizer in fuel systems for rockets

(d) It doesn’t exhibit pyrophoric tendencies in red fuming nitric acid

I had been asked this question in unit test.

This intriguing question originated from Mineral Acids in portion Mineral Acids of Corrosion Engineering

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Correct choice is (c) It has excellent corrosion resistance to fuming nitric acid and it is used as an oxidizer in fuel systems for rockets

Best explanation: Titanium has excellent corrosion resistance to fuming nitric acid and it is used as an oxidizer in fuel systems for rockets. Whereas it exhibits pyrophoric tendencies in red fuming nitric acid if the water content of the acid is below 1.5% and the nitrogen dioxide content is above 2.5%.

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