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Question

Argon is used in arc welding because of its


A

Flammability

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B

Low reactivity with metal

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C

High calorific value

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D

Ability to lower the melting point of metal

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Solution

The correct option is B

Low reactivity with metal


The explanation for the correct option:

B. Low reactivity with metal

Argon:

  • Argon is a noble gas with an atomic number 18 and an atomic symbol Ar.
  • The stability of noble gases is very high.
  • Argon is used in arc welding as it shows low reactivity with metals.
  • During welding, there is no chemical change. But at high temperatures, the metals react with atmospheric oxygen to form oxides.
  • As argon is an unreactive inert gas thus there is no reaction between argon and the welded metal.

The explanation for incorrect options:

A. Argon gas is inflammable.

C. Argon gas has a low calorific value.

D. Argon does not have the ability to lower the melting point of the metal.

Hence, the correct option is B i.e. low reactivity with metal.


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