Surface Chemistry - Result Question 15
####15. The correct match between item-I and Item-II is
(2019 Main, 9 Jan II) A. Benzaldehyde P. Dynamic phase B. Alumina Q. Adsorbent C. Acetonitrile R. Adsorbate
(a) $(A) \rightarrow(R) ;(B) \rightarrow(Q) ;(C) \rightarrow(P)$
(b) (A) $\rightarrow(P) ;(B) \rightarrow(R) ;(C) \rightarrow(Q)$
(c) $(A) \rightarrow(Q) ;(B) \rightarrow(P) ;(C) \rightarrow(R)$
(d) $(A) \rightarrow(Q) ;(B) \rightarrow(R) ;(C) \rightarrow(P)$
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Answer:
Correct Answer: 15. (b)
Solution:
- Using the principle of adsorption chromatography, qualitative and quantitative analysis of benzaldehyde can be done from its mixture with acetonitrile. Here, a mobile phase moves over a stationary phase (adsorbent). Adsorbents used are alumina $\left(Al _2 O _3\right)$ and silica gel. The sample solution of benzaldehyde and acetonitrile when comes in contact with the adsorbent, benzaldehyde gets adsorbed on the surface of the adsorbent. So, benzaldehyde acts as absorbate whereas acetonitrile starts moving as mobile phase over the stationary phase of the adsorbate. Hence, act as dynamic phase.
