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Then D and F Block Elements
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Then D and F Block Elements
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25 Questions

1. Which one of the following characteristics ofthe transition metals is associated with theircatalytic activity? [2003]
2. The lanthanide contraction is responsiblefor the fact that [1997]
3. The oxidation state of Cr in K 2Cr2O7 is[1988]
4. The most durable metal plating on iron toprotect against corrosion is [1994]
5. Photographic films and plates have anessential ingredient of [1989]
6. Ablue colouration is not obtained when[1989]
7. Which of the following ions will exhibitcolour in aqueous solutions? [2010]
8. German silver is an alloy of [2000]
9. Acidified K2Cr2O7 solution turns green whenNa2 SO3 is added to itThis is due to theformation of: [2011]
10. For the four successive transition elements(Cr - Mn - Fe and Co) - the stability of +2 oxidationstate will be there in which of the followingorder? [2011]
11. An acidic solution of \'X\' does not give precipitate on passing H 2 S through it\'X\' gives white precipitate when NH 4OH is added to it. The white precipitate dissolves in excess ofNaOH solutionPure \'X\' fumes in air and dense white fumes are obtained when a glass rod dipped in NH 4OH is put in the fumes. Compound\'X\' can be [1999]
12. Which of the following metals corrodes readily in moist air? [1980]
13. The main reason for larger number of oxidation states exhibited by the actinoids than the corresponding lanthanoids - is [2005 - 2006][2005][2006]
14. Which one of the following is an ore of silver?[1983]
15. The composition of -˜golden spangles-™ is6Nitriding is the process of surface hardeningof steel by treating it in an atmosphere of[1989]
16. Which of the following exhibit only + 3oxidation state? [2012]
17. The electronic configuration of Cu (atomicnumber 29) is [1991]7While extracting an element form its ore - theore is ground and leached with dilpotassium[1990]
18. Which one of the elements with thefollowing outer orbital configurations mayexhibit the largest number of oxidation states?[2009]
19. Among the lanthanides the one obtained bysynthetic method is [1994]
20. Cuprous compounds such as CuCl - CuCNandCuSCNare the only salts stable in water due to[1996]
21. In which of the following pairs are both theions coloured in aqueous solutions? [2006]
22. Which of the following forms colourless compound? [2000]
23. The catalytic activity of transition metalsand their compounds is ascribed mainly to[2012]
24. Which of the following oxidation states arethe most characteristic for lead and tinrespectively? [2007]
25. Stainless steel contains iron and [1995]

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