JEE MAIN - Chemistry (2023 - 10th April Morning Shift - No. 8)
Using column chromatography, mixture of two compounds 'A' and 'B' was separated. 'A' eluted first, this indicates 'B' has
high Rf, weaker adsorption
high Rf, stronger adsorption
low Rf, weaker adsorption
low Rf, stronger adsorption
Explanation
In column chromatography, the compound that elutes first is the one that is less strongly adsorbed to the stationary phase. Hence, 'A' has weaker adsorption than 'B'. Therefore, 'B' has stronger adsorption.
The retention factor (Rf) is a measure of how much a compound moves up the column; a higher Rf means the compound travels further and is less strongly adsorbed to the stationary phase. Since 'A' elutes first, 'A' has a higher Rf than 'B'. Hence, 'B' has a lower Rf.
So, the correct answer is 'Option D: low Rf, stronger adsorption'.
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