Whose clothes are treated as midras (zav-surface impurity) for those who eat terumah?
Halacha 1: the clothes of maaser-sheni eaters are midras for terumah eaters — each level's clothing is midras for the next level up.
Question 2
Someone immersed specifically for maaser sheni. May he now eat terumah?
Halacha 2: Rabbinically, immersing for maaser only achieves purity for maaser. He must immerse again specifically for terumah. (By Torah law all immersions purify for all purposes.)
Question 3
A person was pure for terumah but then 'diverted his attention.' Must he immerse? Must he wait until nightfall?
Halacha 3: when a person pure for terumah diverts attention from eating, he must immerse again — but no nightfall is required, since the fundamental cause is Rabbinic.
Question 4
All vessels found in Jerusalem are presumed pure. What is the one exception?
Halacha 5: all Jerusalem vessels are presumed pure except knives for slaughtering sacrificial animals — because the stringency of kodesh requires this exception.
Question 5
Terumah contacted one of the six sources that warrant burning, but the person is uncertain whether contact actually occurred. Should the terumah be burned?
Halacha 12 (last halacha): if there is a doubt whether contact occurred with one of the six sources, it becomes a double doubt — the fundamental status is doubtful AND the contact is doubtful. Double-doubt terumah is suspended, not burned.