When the fourteenth of Nisan falls on Shabbat, when is the chametz search conducted?
When Pesach begins Saturday night, the search is moved to Thursday night (the night of the thirteenth), and the chametz is burned on Friday — since one cannot burn on Shabbat.
Question 2
What is the deadline for nullifying chametz on the fourteenth of Nisan?
The Rambam rules that chametz must be nullified before the sixth hour on the fourteenth. One who fails to do so has violated the positive commandment to destroy chametz.
Question 3
If a person forgot to search on the night AND morning of the fourteenth, what must he do?
The Rambam rules that such a person must search during the holiday itself, setting aside chametz for the day's needs before destroying the rest.
Question 4
When pure and impure Terumah loaves must be burned on Erev Pesach/Friday, which are burned first?
The pure loaves are burned first — so that if a kohen arrives while there is still time, he may eat the pure Terumah. Only afterward are the impure loaves burned.
Question 5
Which is NOT listed as a valid method of destroying chametz?
The Rambam lists three valid methods: burning, crumbling and scattering to the wind, and throwing into the sea. Burying is not listed as valid.