Fun Riddles

Question: I'm heavy but not backwards.

What am I?

Question: A container that takes no keys,
but a golden delight lies within me.

What am I?

Question: Christmas and New Year's Day occur exactly one week apart. So a New Year's that occurs right after Christmas should be on the same day of the week. But in the year 2020 Christmas will occur on a Friday and New Year's on a Wednesday.

Why is this?

Question: I'm written with two letters, said with one and seen with two.What am I?

Question: What is the longest word in the dictionary?