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At the factory, chisels are ground to a bevel of from 25° to 35°, but it's left up to you to put the final edge on it. Your new chisel is merely roughed in and ready for you to make truly sharp. For stringed instrument work, you need the keenest of edges.
Then, what angle is a chisel sharpened at?
Standard bench and butt chisels are traditionally ground at the factory to 25°, and this is fine for most work, but the edge will last longer if you add a 5° microbevel to make a 30° cutting angle.
Considering this, can you sharpen chisels with sandpaper?
Using sandpaper to sharpen a chisel. While you can use a bench grinder or sharpening stone to sharpen a dull chisel, a piece of sandpaper on a flat surface can be used to get the job done, too.
Sharpening your chisel can be simply honing your chisel regularly to keep the cutting edge razor sharp or sharpening your chisel on the bench grinder and then honing the chisel.