Are the stones from a demolished blemished house permitted for benefit (e.g., building material)?
Halacha 1: the stones, wood, and mortar are all forbidden for any benefit. Even burning them and making lime does not render them permitted, derived from 'accursed tzara'at — consider it a curse and do not benefit from it.'
Question 2
A person enters a blemished house entirely backwards (rear-first), ending up fully inside except for his nose. What is his status?
Halacha 5: entering backwards does not create impurity even if the entire body enters except for the nose — 'one who COMES INTO the house' means the Torah specified impurity only for ordinary (forward) entry.
Question 3
A person enters a blemished house wearing clothes. When do the clothes become impure?
Halacha 6: the person becomes impure immediately, but worn garments remain pure until the person has been inside long enough to eat the equivalent of three egg-sized portions of wheat bread — derived from the verse equating lying and eating in the house.
Question 4
According to the Rambam's concluding remarks, what is the spiritual purpose of tzara'at afflictions on houses, garments, and skin?
Halacha 10 (final) explains: tzara'at on houses, garments, and skin is a miraculous sign and wonder unique to Israel, intended to warn against lashon hora. The progression — house → leather items → clothing → skin — gives the speaker multiple opportunities to repent.
Question 5
A pure earthenware container is in a blemished house — it is covered but not sealed with a tight cover. Are its contents protected?
Halacha 9: covered containers in a blemished house protect their contents — the rule is more lenient than in a house with a corpse. Any covered container (even without a tight seal) protects food, beverages, and implements within it.