What does below chemistry rebus means?

You bought me for dinner but never eat me. What am I?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

Paul's height is six feet, he's an assistant at a butcher's shop and wears size 9 shoes. What does he weigh?

Find the combined weight of the Cat, Dog and Rabbit in the given picture.

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

What is the word or phrase?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Suppose you are a girl candidate and sitting in an interview. Suddenly the interviewer asks you, 'What if one morning you wake up and find out that you are pregnant?

How will you reply to such a question?