Colour of liquid oxygen is

colourless

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pale yellow

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pale blue

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Solution

The correct option is C pale blue

$\to$ Solid and liquid dioxygen is pale blue in colour because of excitation of unpaired eletrons.
$\to$ Dioxygen is colourless in gas form.

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The correct increasing order of the boiling points of liquid oxygen, liquid argon and liquid nitrogen present in liquid air is :

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H N O_{3}

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