Discussion
Assertion (A) : As the rhodamine 'B' in ballpoint pen ink degrades, it loses the ethyl groups.
Reason (R) : The ethyl groups are replaced by hydrogen atoms.
Codes :
Answer: A
Both statements are true. As rhodamine B in a ballpoint ink degrades, it loses its ethyl groups one at a time, and each one is replaced by a hydrogen atom, so the molecule changes into less substituted forms that can be measured to date the ink.
The options saying that either statement is false are wrong, because this de-ethylation is the observed pathway. Measuring how far this loss has gone gives the relative age of an ink entry, so the process is one of the few chemical methods that give an indication of the date of writing.
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