3. Four substances that exist in a gaseous state .

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Solution

Substances which having neither fix volume nor fix shape & size due to weak inter molecular forces is consider as gas .
Four substances that exist in a gaseous state are oxygen , carbon dioxide, hydrogen, nitrogen.

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3. Four substances that exist in a gaseous state .

Substances which having neither fix volume nor fix shape & size due to weak inter molecular forces is consider as gas .Four substances that exist in a gaseous state are oxygen , carbon dioxide, hydrogen, nitrogen.

Substances which having neither fix volume nor fix shape & size due to weak inter molecular forces is consider as gas .
Four substances that exist in a gaseous state are oxygen , carbon dioxide, hydrogen, nitrogen.