1.

The noble gases have closed- shell electronic configuration and are monoatomic gases under normal conditions. The low boiling points of the lighter noble gases are due to weak dispersion forces between the atoms and the absence of other interatomic interactions. The direct reaction of xenon with fluorine leads to a series of compounds with oxidation number +2,+4 and +6. XeF_(4) reacts violently with water to give XeO_(3). The compound of xenon exhibit rich sterochemistry and their geometries can be deduced considring the total number of electron pairs in the valence shell. Argon is used in arc welding because of its:

Answer»

low reactivity with metal
ability to LOWER the MELTING POINT of metal
flammability
high CALORIFIC value

Answer :A


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