Seliwanoff test and Xanthoproteic test are used for the identification of ______ and ______ respectively.

Seliwanoff's test is used to distinguish between aldoses and ketoses. In this test, a sugar is heated with resorcinol in concentrated HCl. Ketoses (like fructose) react faster than aldoses and produce a deep cherry-red colour within a short time, confirming the presence of a ketose sugar.

Xanthoproteic test is used to identify proteins. In this test, concentrated nitric acid is added to the protein solution and heated. Proteins containing aromatic amino acids (such as tyrosine, tryptophan, and phenylalanine) undergo nitration of the aromatic ring, giving a yellow colour. On adding alkali (NaOH), the colour turns orange, confirming the presence of proteins.

Therefore, Seliwanoff's test identifies ketoses and the Xanthoproteic test identifies proteins. The correct answer is ketoses, proteins.