1) Which of the following statement is incorrect about gas chromatography? a) GC

Question

1) Which of the following statement is incorrect about gas chromatography?

a) GC is useful for separating non-polar volatile compounds.

b) GC is not suitable for separating those compounds that are thermally labile.

c) Temperature programing can improve the separation efficiency for GC.

d) GC often provides better separation efficiency than LC because GC has inherently lower plate height than LC

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1b) Which of the following statement is not correct about Van Deemter Equation (H = A + B/v + Cv)?

a) The A term describes the loss of separation efficiency arising from multiple flow paths of the mobile phase in the packed column.

b) The A term is often negligible for an open-tubular column

c) The concentration gradient of analyte in the separation system can contribute to poorer separation efficiency because of the diffusion of the analyte along the column axis.

d) Because of resistance to mass transfer, a higher mobile phase flow rate can give rise to a greater number of theoretical plates for the separation.

Explanation / Answer

1) Incorrect statement :

Ans = b) GC is not suitable for separating those compounds that are thermally labile.

2) Ans = c

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