Which number should replace the question mark?

What does this rebus puzzle means ?

I have a big mouth and I am also quite loud! I am NOT a gossip but I do get involved with everyone's dirty business.

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

There was a competition where the contestants had to hold something. At the end of the event, the winner was a person who had no hands or feet. What was it that the contestants had to hold?

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

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

I have 50 feet long of cloth, I need to create 50 handkerchiefs each size of 1 foot. I take one minute to cut a 1-foot handkerchief. So how long will it take to cut 50 handkerchiefs?