What is black when you buy it, red when you use it, and gray when you throw it away?

What is the word or phrase?

There is something which you can be arrested for attempting but not for successfully completing.

On a special event at the prison, 5 prisoners John, Jacob, Krist, Tang, and Dang given a chance to go to a sauna and can bring one thing with them.

Following are the things that the prisoners bring with them.
John: A soda
Jacob: Thermos
Krist: Book named "How to kill"
Tang: A Walkman
Dang: Harmonica

Since it is a Sauna, no one can see each other. After a while When the steam is switched, Tang was found dead and there was blood all around.
J Bond was called and he instantly come to know who can be the murderer. How?

How can you make a TV, a bed, a dog, and a car liquid?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

John was going on a jungle trip. He asked his wife to pack something to eat, something to drink and something to burn if he feels cold in the jungle. When John opens the backpack he found just one thing in the bag. What was it?

If your uncle’s sister is not your aunt, what relation is she to you?

You can hear me, but you can't touch or see me.

What am I?

Which is the correct shadow of the bird?