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

The answer I give is yes, but what I mean is no. What was the question?

How can you leave a room with two legs and return with six legs?

What's a single-digit number with no value?

If six children and two dogs were under an umbrella, how come none of them got wet?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

Can you find out the number that should replace the question mark with a valid reason?

I have feet, but no legs. Which animal Am I?

John Went to the nearby store in a Mall to buy something for her home. Below is the conversation between the two:

John: How much for the one?
Shopkeeper: It is $2
John: How much for the Eleven?
Shopkeeper: It is $4
John: How much for the Hundred?
Shopkeeper: It is $6.

What is John buying?

A father's child, a mother's child, yet no one's son.

Who am I?