Trying to extract pixel values from a given PNG image

Question

Trying to understand PNG format.

Consider this PNG Image:

Answer 1

I did not look too carefully but from looking at the structure...

Q11. C6 25 AA 3E = CRC32 00 00 00 C2 = Size of next chunk

Q13. check the png spec's you referred to earlier that looks like the IDAT chunk you allready know the compression applied to it!

Q15. AE 42 60 82 = CRC32