Which seven liquids are specified as making foods susceptible to ritual impurity?
Halacha 2 explicitly lists the seven liquids: water, dew, oil, wine, milk, blood, and honey. Fruit juices and olive brine are specifically excluded.
Question 2
What is the status of grape seeds and grape pomace that were collected to serve as food?
Halacha 10 states that grape seeds and grape pomace, even though collected to serve as food, do not contract the impurity associated with foods.
Question 3
If congealed oil is thought of as food while it is congealed, what is its status?
Halacha 18 states that congealed oil is neither food nor liquid, and even if one thinks of it as either while congealed, his thought is of no consequence.
Question 4
According to halacha 24, which of the following forbidden foods IS susceptible to ritual impurity?
Halacha 24 distinguishes: foods forbidden for any benefit (orlah, mixed vineyard species, stoned ox) are not susceptible, while foods forbidden to eat but permitted for benefit (like non-kosher meat) are susceptible.
Question 5
When do grapes become susceptible to the ritual impurity of liquids after being trodden upon?
Halacha 23 states that once one has crisscrossed over the grapes (in the winepress), they become susceptible to the ritual impurity associated with liquids.