JEE Advanced Chemistry question

Inert atmosphere for welding of metals is obtained by

(A)Ar, HeCorrect
(B)N2, He
(C)O2, N2
(D)Ar, N2

Answer: (A)

Solution

Shielding gases for arc welding (TIG/MIG) must be chemically inert toward the molten metal being welded; argon and helium are true noble gases and do not react with hot metal surfaces, making them standard shielding gases. Nitrogen,

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Question ID VK-159351