For what purpose (terumah or kodesh) may a person immerse vessels inside a larger container vessel?
Halacha 1: for terumah, immersing vessels within a larger vessel is permitted. For kodesh it is forbidden lest the container's mouth is narrow and the inner vessel was immersed in vessel-water rather than mikveh water.
Question 2
The outer surface of a vessel contracted impurity from liquids. For terumah purposes, what is the status of liquids inside it?
Halacha 2: for terumah, when only the outer surface contracts impurity, the inner space remains pure. For kodesh, the entire vessel (including inside) becomes impure.
Question 3
Why must new vessels (completed in a pure state) still be immersed before use for kodesh?
Halacha 6: the Sages required immersion for new vessels before kodesh as a decree against spittle of an unlearned person (am ha'aretz) who may have touched it while it was still moist during production.
Question 4
A container holds raisins and dried figs (not touching each other). Impurity touches one fig. For kodesh, what happens to the rest?
Halacha 7: for kodesh, a container joins all its contents as one entity — impurity to one item spreads to everything in the container, even if items are not touching each other.
Question 5
An onen (one in acute mourning) has completed his mourning. Must he immerse before eating terumah?
Halacha 15 (halacha 14): an onen may eat terumah — no immersion is required. However, for kodesh, immersion is required after his mourning ends because he may have diverted his attention from purity.