Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

In a chess board, the queen piece can move horizontally, vertically and diagonally freely. The picture represents the same.Can you place 8 queens on the board in a manner that none of the queens can attack each other?

What does this mean?

CCCCCCC

In the following series, a set of numbers is progressing with a particular pattern. Can you deduce that pattern and find the missing set?

(2 + 6), (21 + 6), (58 + 6), (119 + 6), ___

What is always in front of you but can’t be seen?

Why despite killing dozens of people Charley and Wilma were not punished?

Can you name an animal whose killing cannot be performed without spilling your own blood?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

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

As a whole I am both
safe and secure.

Behead me and I become
a place of meeting.

Behead me again and I am
the partner of ready.

Restore me, and I become
the domain of beasts.

What am I?