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

I am an eight letter word and I am a computer terminology.
The second, third and fourth letters make an animal.
The fourth, fifth, sixth, seventh and eighth letters make a weapon.
The first, second, third and fourth letters can be taken as an outcome of any exam.
The fifth, sixth, seventh and eighth letter combine to form a high end typing software.

Can you tell who am I ?

There is a family that live in a round house. The two parents go out for a movie and leave a babysitter to watch their son. They come back and the kid was not there. Some one kidnapped him. The maid said she was cleaning in a corner. The cook said he was making pizza. The babysitter said she was getting a board game. Who kidnapped him.

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

Which alphabet is a part of our body?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

I know a nine-letter word having only one vowel.
Do you ?

Complete the table series riddle by finding the number that can replace "??".

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.