Q116 · Practice questionSimple familiar1 mark
QUESTION 116
An amino-acid sample produces one spot on a TLC plate. Which conclusion is justified?
(A)
The sample must contain exactly one amino acid.
(B)
All amino acids in the sample have zero net charge.
(C)
The sample has only one resolved component under these conditions.
(D)
The sample cannot contain an amino acid with the same Rf as a standard.
WORKED SOLUTION
1 markAnswer C
Answer
C
Working
One resolved spot may contain more than one co-migrating substance. Purity cannot be established from one TLC result alone.
Marking criteria
- Select C. [1 mark]
Practice question aligned to the current QCAA syllabus; review the worked solution and marking criteria.
View the QCAA syllabus