To obtain pure carbon (II) oxide from its mixture with carbon (IV) oxide, the mixture should be
passed over heated copper (II) oxide
bubbled through water
bubbled through concentrated tetroxosulphate (VI) acid
bubbled through sodium hydroxide
Explanation
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Yes correct because Sodium hydroxide removes Carbon(iv) oxide, also potassium hydroxide removes carbon(iv) oxide...I also want to use this medium to apologize to anyone I've hurt with my reply publicly, I'm really sorry, hope you understood my reply? For Oxygen; Alkaline pyrogallol and also red hot phosphorus removes it, for water; mostly dehydrating agents like H2SO4 and CaCl2 removes it. There are many more just do more research on your own

myschool please the answer to this question is water
u can obtain the carbon monoxide from carbon IV oxide by deeping it in water at 3 atmosphere

Also to Ayomini for my reply, I'm deeply sorry. i replied out of impulse.
Come to think of it, carbon monoxide is insoluble in water but Carbon(iv)oxide dissolves in water to form a weak acis

