Los lapices son de Alex.
Write questions for these answers.
Los lápices son de Alex.
This seems to be a homework question. It is actually required here that you try to provide your own answer first, & we will help you with correcting it if necessary. Anyway, I posted an answer on your previous post to give you an idea of how to construct the question.
El lápiz, los lapices, does the plural of lápiz carry the tilde over the a? I think not because it changes to a three sylable word.
This question has been posted three times!