a) Two mixed metal oxide catalysts were made separately using hydrothermal synthesis under different conditions. Characterisation of the two samples using powder X-ray diffraction showed patterns with peaks at the same 20, but with significantly different intensities. i) What information can be obtained about the catalysts from the XRD data? ii) Explain why the differences in the data arise. iii) What other technique could you use to confirm any differences between the catalysts