Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

You are an expert on paranormal activity and have been hired to locate a spirit haunting an old resort hotel. Strong signs indicate that the spirit lies behind one of four doors. The inscriptions on each door read as follows:

Door A: It's behind B or C
Door B: Its behind A or D
Door C: It's in here
Door D: It's not in here

Your psychic powers have told you three of the inscriptions are false, and one is true. Behind which door will you find the spirit?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

What is so fragile that saying its name breaks it?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

You visit a home for specially-abled children on the occasion of Christmas where you meet with 50 children. You have a box of chocolates containing 50 chocolates exactly.

What if you were asked to one chocolate to each child in a manner that one chocolate still remains in the box? Is it possible?

Manish and Manoj play 5 games of chess.
Both Manish and Manoj win the exact same number of games. There is no tie at all.

How?