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A quantity of air was passed through a weighed amount of alkaline pyrogallol. An increase in the weight of the pyrogallol would result from the absorption of

A. nitrogen

B. neon

C. argon

D. oxygen

QUICK ANSWER…

D

DETAILS…  

Alkaline pyrogallol is well known for its hunger and strong affinity for oxygen, in fact, the surest way to take out oxygen from a small quantity of air is to pass it through alkaline pyrogallol.

Now for the right answer to the above question:

1. Option A is incorrect. pyrogallol does not absorb nitrogen.
2. Option B is incorrect. pyrogallol does not absorb neon.
3. C is incorrect. pyrogallol does not absorb argon.
4. D is the correct answer. pyrogallol has strong affinity for oxygen.

KEY-POINTS…

You may please note these/this:

• The increase in weight of the pyrogallol is as a result of additional weight of absorbed oxygen.

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/ culled from 2015 JAMB-UTME Chemistry PAST question 14 /