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Which of the following metals comes in an exothermic group of metals when the solubility of hydrogen is concerned?

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Which of the following metals comes in an exothermic group of metals when the solubility of hydrogen is concerned?

(a) Iron

(b) Titanium

(c) Magnesium

(d) Nickel

The question was posed to me at a job interview.

The above asked question is from Gases in Metals in division Pouring – Gating Design, Melting Furnaces, Melting and Casting Quality of Casting-Forming-Welding I

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Correct option is (b) Titanium

To explain: When the solubility of hydrogen is concerned, titanium comes in an exothermic group of metals which absorb more hydrogen than endothermic metals (iron, magnesium, nickel etc). Further, in exothermic metals, the solubility of hydrogen decreases with temperature. The reverse is true for endothermic metals.

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