Discussion
The adsorbent which has higher adsorptive power in column chromatography is :
Answer: D
The adsorbent with the higher adsorptive power is Al2O3.
In column chromatography the common adsorbents are ranked by their activity (adsorbing strength). Activated alumina is the strongest of those listed: its surface has Lewis-acidic aluminium sites and hydroxyl groups that hold polar compounds firmly. Silica gel is a little weaker and is the most widely used general adsorbent. Magnesium oxide is weaker still, and calcium carbonate is a weak adsorbent used for very sensitive compounds such as some plant pigments.
So, in the standard order of decreasing activity, alumina comes ahead of silica, magnesia and calcium carbonate.
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