Short Riddles and Answers

Question: I have Eighty-eight keys but cannot open a single door?

What am I?

Question: Why does the second shape have an open block when the first shape does not?

Question: Which is correct "The yolk of the egg is white" or "The egg yolk is white?"

Question: I'm not a pool, a tree, a slave, a website, or a shirt.

What am I?

Question: You put me on a table and cut me, but you don't eat me.

What am I?