(1) Which of the following is NOT used as a sorbent (stationary phase) for chrom

Question

(1) Which of the following is NOT used as a sorbent (stationary phase) for chromatography: A starch
B sand
C alumina
D silica gel
E cellulose
A hexane
B EtOAc/Hexane 1:20
C EtOAc/Hexane 1:10
D both hexane and EtOAc/Hexane 1:20
E both EtOAc/Hexane 1:10 and EtOAc/Hexane 1:20
A - B will elute first and A will elute last
B D will elute first and C will elute last
C B will elute first and D will elute last
D A will elute first and C will elute last
E C will elute first and D will elute last

Which of the following factors affect the resolution (separation) of two compounds: (A) nature of the stationary phase; (B) eluent composition; (C) amount of sorbent used; (D) color of compounds being separated? A A and B
B A, B, and C
C B and C
D B, C, and D
E all these factors (1) Which of the following is NOT used as a sorbent (stationary phase) for chromatography: A starch
B sand
C alumina
D silica gel
E cellulose
mixture of two compounds was spotted on three TLC plates (A-C). The plates were developed using three different eluent systems: Hexane, EtOAc/Hexane 1:20, and EtOAc/Hexane 1:10 (the listed order of eluents does not correspond to the order of TLC plates shown). Which eluent system is the most suitable to perform preparative separation of the two compounds?


A hexane
B EtOAc/Hexane 1:20
C EtOAc/Hexane 1:10
D both hexane and EtOAc/Hexane 1:20
E both EtOAc/Hexane 1:10 and EtOAc/Hexane 1:20
Which of the following compounds will be the first to elute from a reverse phase silica gel chromatography column? Which will be the last?


A - B will elute first and A will elute last
B D will elute first and C will elute last
C B will elute first and D will elute last
D A will elute first and C will elute last
E C will elute first and D will elute last

Which of the following factors affect the resolution (separation) of two compounds: (A) nature of the stationary phase; (B) eluent composition; (C) amount of sorbent used; (D) color of compounds being separated? A A and B
B A, B, and C
C B and C
D B, C, and D
E all these factors Which of the following is NOT used as a sorbent (stationary phase) for chromatography: starch sand alumina silica gel cellulose mixture of two compounds was spotted on three TLC plates (A-C). The plates were developed using three different eluent systems: Hexane, EtOAc/Hexane 1:20, and EtOAc/Hexane 1:10 (the listed order of eluents does not correspond to the order of TLC plates shown). Which eluent system is the most suitable to perform preparative separation of the two compounds? hexane EtOAc/Hexane 1:20 EtOAc/Hexane 1:10 both hexane and EtOAc/Hexane 1:20 both EtOAc/Hexane 1:10 and EtOAc/Hexane 1:20 Which of the following compounds will be the first to elute from a reverse phase silica gel chromatography column? Which will be the last? B will elute first and A will elute last D will elute first and C will elute last B will elute first and D will elute last A will elute first and C will elute last C will elute first and D will elute last Which of the following factors affect the resolution (separation) of two compounds: (A) nature of the stationary phase; (B) eluent composition; (C) amount of sorbent used; (D) color of compounds being separated? A and B A, B, and C B and C B, C, and D all these factors

Explanation / Answer

1. B - Sand

2. B - EtOAc/Hexane 1:20

3. B - D will elute first and C will elute last

4. B - A, B, and C

Experience: I got 100% on the quiz.

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