Which of the following gases plays an important role in welding titanium, aluminium, stainless steel, and magnesium?

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Accepted Answer

1. Role of shielding gas:

- In welding, a shielding gas prevents the molten metal from reacting with atmospheric oxygen and nitrogen, avoiding contamination and defects.

2. Which gas fits this role?

- Argon ($Ar$) is an inert noble gas commonly used as a shielding gas for welding titanium, aluminium, stainless steel, and magnesium because it is chemically nonreactive, provides good arc stability, and is cost-effective.

3. Why the others are incorrect:

- Fluorine and chlorine are highly reactive halogens and would chemically attack the metals and contaminate welds.
- Neon is a noble gas but is expensive and not used in welding applications.

Therefore the correct choice is Argon (option 3), corresponding to choice c.

FINAL_ANSWER: c

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