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Question

Argon is used:
to obtain low temperature.
in filling airships.
in high temperature welding.
in radiotherapy for treatment of cancer.

A

to obtain low temperature.

B

in radiotherapy for treatment of cancer.

C

in filling airships.

D

in high temperature welding.

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Solution

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Argon is used to form inert atmospheres for high-temperature arc welding.
Option $C$ is correct.

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