JEE Main · 2019 · 09 Jan 2019 · Shift 2 · Practical and Analytical Chemistry

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The correct match between item I and item II is
Item I
Item II
(a) Benzaldehyde
(b) Alumina
(c) Acetonitrile
(p) Mobile phase
(q) Adsorbent
(r) Adsorbate

(A)a $\to q, b \to p, c \to r$
(B) $a \to r, b \to q, c \to p$ ✓ Correct
(C) $a \to q, b \to r, c \to p$
(D) $a \to p, b \to r, c \to q$

Answer: (B)

Solution

In chromatography three roles must be matched up. Alumina is the stationary solid that holds the mixture, so it is the adsorbent. Benzaldehyde is the substance being separated as it clings to and releases from that solid, so it is the adsorbate. Acetonitrile is the solvent washed through, so it is the mobile phase. That pairs benzaldehyde with adsorbate, alumina with adsorbent, and acetonitrile with mobile phase.

JEE Main · 2019 · 09 Jan 2019 · Shift 2 · Single correct option

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JEE Main · 2019 · 09 Jan 2019 · Shift 2 · Practical and Analytical Chemistry

Solution

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