If you mean classic (Which I think you do) It wasn't made to explode (as is: It can't)
I assume you mean TNT. All you have to do is hit it.
The previous way to explode TNT was by punching it. However, you can also make the TNT explode by placing it near lava (a timely manner to explode it), clicking on it with flint and steel, or any contact with fire. If you were not in classic, it could also be ignited by Redstone or fire charge or even a fire arrow (assuming you have the latest version of Minecraft). In the related links below, I have listed the wiki article for TNT.
redstone torch
The ID (code) for TNT in Minecraft is 46.
If you mean classic (Which I think you do) It wasn't made to explode (as is: It can't)
Not without a mod. 303 Arrows mod is good for what you are looking for but I think it is outdated
I assume you mean TNT. All you have to do is hit it.
To make TNT, place 5 gunpowder and 4 sand
The previous way to explode TNT was by punching it. However, you can also make the TNT explode by placing it near lava (a timely manner to explode it), clicking on it with flint and steel, or any contact with fire. If you were not in classic, it could also be ignited by Redstone or fire charge or even a fire arrow (assuming you have the latest version of Minecraft). In the related links below, I have listed the wiki article for TNT.
redstone torch
The ID (code) for TNT in Minecraft is 46.
Idgaf
5 Gunpowder and 4 Sand
You can set TNT off in Minecraft Beta by clicking it, or by triggering it with redstone.
The number ID for TNT is; 46.
tnt. you do this but getting 5 gunpower and a bit of sand. go on minecraft wiki for more help.