16. 17. The IUPAC nomenclature of an element with electronic configuration [Rn] 5f46d17s is: (a) Unnibium (b) Unnilunium (c) Unnilquandium (d) Unniltrium The compound(s) that is (are) removed as slag during the extraction of copper is: (A) CaO (B) FeO (C) Al2O3 (D) ZnO (E) NiO shiksha Choose the correct answer from the options given below. (a) (C). (D) only (b) (A), (B), (E) only (c) (A), (B) only (d) (B) only 18. The reaction of H2O2 with potassium permanganate in acidic medium leads to the formation of mainly. (a) Mn2+ (b) Mn (c) Mn+ (d) Mn+ 19. Choose the correct order of density of the alkali meals: (a) Li < K < Na (a) Trigonal planar (b) Tetrahedral (c) Pyramidal (d) Square planar