Will I need an adapter?
You will need an adapter. See my link to Ken Rockwell below. If you purchase an adapter, please do so through his site to support his business.
Can I use a 9.5 volt adapter insead of a 12volt required adapter. Will it work?
If something you have requires 12 volts to operate , a 2.5 volt drop may be to much of a voltage drop, depending upon what your talking about. If you have access to the manual of the device , look ...
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I'm going to buy an infrared adapter to transfer pics from cell to PC, will I need anything else for my mobile?
You will proberbly get a faster data transfer rate with a USB Phone lead than IR or even Blue-tooth.Check out the cost also, might be cheaper, mine was.
Will a 5V 2.5A adapter damage a device that requires a 6V 2A adapter?
No, underpowering will not "power" the device, it will not run. You must get an adapter that is 6V and (2A or higher) will be ok as well.