Noble gases are group of elements which exhibit very
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11. Noble gases are group of elements which exhibit very *
(a) High chemical activity(b) Much paramagnetic properties(c) Minimum electronegativity(d) High ionization enthalpiesQ 12. The ionic character in H-X bond is highest in *(a) HBr(b) HI(c) HF(d) HClQ 13. Which of the following group 16 element has maximum catenation capacity? *(a) S(b) Se(c) O(d) TeQ 14. Which one of the following exhibits the largest number of oxidation states? *(a) Ti (22)(b) Cr (24)(c) V (23)(d) Mn (25)Q 15. Which of the following oxidation state is common for all lanthanides? *(a) +2(b) +3(c) +4(d) +5Q 16. Which of the following statements about the interstitial compounds is incorrect? *(a) They retain metallic conductivity(b) They are chemically reactive(c) They are much harder than the pure metal(d) They have higher melting points than the pure metalQ17. In addition to uranium, which other actinoid occurs naturally in Significant amounts? *(a) Actinium(b) Plutonium(c) Protactinium(d) ThoriumQ 18. The IUPAC name of the complex [Co (NH₃)₄ Cl₂] Cl is *(a) tetraammine trichloro cobalt (III) chloride(b) dichloro tetraammine cobalt (III) chloride(c) tetraammine dichloro cobalt (IV) chloride(d) tetraammine dichloro cobalt (III) chlorideQ 19. The number of unidentate ligands in the complex ion is called *(a) EAN(b) primary valency(c) oxidation number(d) Coordination numberQ 20. Which of the following is not considered as an organometallic compound? *(a) Ziese's salt(b) Ferrocene(c) Cis − platin(d) Grignard reagent