My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

Which English verb becomes past tense just by rearranging the letters?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

Bay of Bengal is in which state?

What number do you get when you multiply all of the numbers on a telephone's number pad?