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

Be active and find the killer in the picture Riddle below.

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

Which digit occurred maximum times between the number 1 and 1000?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

Can you move 2 matchsticks to form four equal sized squares.