What is the penalty for intentionally eating a k'zayit of chametz on Pesach?
Halacha 1: one who intentionally eats a k'zayit of chametz on Pesach is liable for karet. Unintentional eating requires a fixed sin offering.
Question 2
Is it permitted to derive benefit from chametz on Pesach (e.g., selling it)?
Halacha 2: chametz on Pesach is forbidden for benefit by Torah law — it may not be used for any purpose whatsoever.
Question 3
What is the status of chametz bought after Pesach from a Jewish store that kept chametz during Pesach?
Halacha 4: chametz possessed by a Jew during Pesach is permanently forbidden for benefit as a Rabbinic penalty. One may not buy chametz after Pesach from a store that violated the prohibition.
Question 4
What is the penalty for eating a chametz mixture (e.g., Babylonian kotach) on Pesach?
Halacha 6: eating a mixture containing chametz incurs lashes (not karet), based on the verse 'Do not eat any leaven.' Karet applies only to chametz itself.
Question 5
Until what hour may one eat chametz on the 14th of Nisan?
Halacha 10: one may eat chametz until the end of the 4th hour. In the 5th hour the Sages forbid eating (though benefit is permitted). From the 6th hour — even benefit is forbidden.