When a sample of air is passed through alkaline pyrogalol, potash and finally through U-tube containing fused calcium chloride, the components of air left unabsorbed are
The main components of air are nitrogen (~78%), oxygen (~21%), noble gases (~0.9%), carbon dioxide (~0.04%), and variable amounts of water vapour. After these steps, all oxygen, carbon dioxide, and water vapor are removed, leaving nitrogen and the noble gases (predominantly argon) as the remaining unabsorbed components.
Recall that Air is a mixture of gases. These gases comprises mainly nitrogen, oxygen, carbon(IV) oxide, noble gases, and water vapour. Alkaline pyrogallol is used to absorb oxygen from the air. Potash (potassium carbonate, though potassium hydroxide is more common in this context) absorbs carbon(IV)oxide (carbon dioxide). Fused calcium chloride is a drying agent used to absorb water vapor (moisture).
After passing the air sample through all three substances, the components of air that are left unabsorbed are the chemically inert noble gases (like argon, neon, etc.) and the relatively unreactive nitrogen, which together make up the bulk of the remaining gas.
Correct answer is noble gases and nitrogen - Option C
There is an explanation video available below.
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