pBlock ElementsII 2 Question 28
30. Argon is used in arc welding because of its
(a) low reactivity with metal
(b) ability to lower the melting point of metal
(c) flammability
(d) high calorific value
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Solution:
- Ar, being inert, provide inert atmosphere in arc welding, and prevent from undesired oxidation.
$\mathrm{Xe}$ is $s p^{3}$-hybridised with one lone pair. Hence, molecule of $\mathrm{XeO}_{3}$ has pyramidal shape.
