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The P - Block Elements (Group 15 - 16 - 17 - 18)
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The P - Block Elements (Group 15 - 16 - 17 - 18)
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25 Questions

1. Oxygen will directly react with each of thefollowing elements except [1989]
2. The structural formula of hypophosphorousacid is [1997]
3. Which of the following oxide is amphoteric?[2011]
4. Aqueous solution of ammonia consists of[1991]
5. Which of the following is a polar molecule?[2013]
6. When orthophosphoric acid is heated to600°C - the product formed is [1989]
7. Bleaching powder is obtained by the action of chlorine gas and [1988]
8. Which of the following oxy-acids has themaximum number of hydrogens directlyattached to phosphorus? [1999]
9. Which one of the following arrangementsdoes not give the correct picture of the trendsindicated against it? [2008]
10. Noble gases do not react with otherelements because [1994]
11. Hypo is used in photography to [1988]
12. Which one of the following compounds is aperoxide? [2010]
13. Bleaching powder reacts with a few drops ofdilute HCl to give [1989]
14. Oleum is [1991]
15. Which one has the lowest boiling point?[1989]
16. In the manufacture of bromine from seawater - the mother liquor containing bromides istreated with [1992]
17. Nitrogen is relatively inactive elementbecause [1992]
18. Repeated use of which one of the followingfertilizers would increase the acidity of the soil?[1998]
19. The gases respectively absorbed by alkalinepyrogallol and oil of cinnamon are [1989]
20. Each of the following is true about white andred phosphorus except that they [1989]
21. P2O5 is heated with water to give [1991]
22. How many bridging oxygen atoms arepresent in P4O10? [2010]
23. Sugarcane on reaction with nitric acid gives[1992]
24. PH4 I+ NaOH forms [1991]
25. By passing H 2Sgas in acidified KMnO4solution - we get [1995]

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