Using column chromatography, mixture of two compounds ‘AA’ and ‘BB’ was separated. ‘AA’ eluted first, this indicates ‘BB’ hasJEE Main 2023 (10 Apr Shift 1)Alow RfRf, stronger adsorptionBhigh RfRf, weaker adsorptionChigh RfRf, stronger adsorptionDlow RfRf, weaker adsorption
Question
Using column chromatography, mixture of two compounds ‘AA’ and ‘BB’ was separated. ‘AA’ eluted first, this indicates ‘BB’ hasJEE Main 2023 (10 Apr Shift 1)Alow RfRf, stronger adsorptionBhigh RfRf, weaker adsorptionChigh RfRf, stronger adsorptionDlow RfRf, weaker adsorption
Solution
In column chromatography, the compound that elutes first is the one that has weaker adsorption to the stationary phase. This is because it spends more time in the mobile phase, moving down the column faster.
The Retention factor (Rf) value is a measure of how much a compound moves in the chromatography process. A higher Rf value indicates that the compound moves more, which is associated with weaker adsorption.
Therefore, if 'AA' elutes first, it has a higher Rf value and weaker adsorption. This means 'BB' has a lower Rf value and stronger adsorption.
So, the correct answer is A: low Rf, stronger adsorption for 'BB'.
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