Read and download free pdf of CBSE Class 12 Chemistry Representative Elements Worksheet. Students and teachers of Class 12 Chemistry can get free printable Worksheets for Class 12 Chemistry Representative Elements in PDF format prepared as per the latest syllabus and examination pattern in your schools. Class 12 students should practice questions and answers given here for Chemistry in Class 12 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 12 Chemistry Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems with solutions on daily basis to get more score in school exams and tests
Worksheet for Class 12 Chemistry Representative Elements
Class 12 Chemistry students should refer to the following printable worksheet in Pdf for Representative Elements in Class 12. This test paper with questions and answers for Class 12 will be very useful for exams and help you to score good marks
Class 12 Chemistry Worksheet for Representative Elements
Elements.
1. In contrast to nitrogen, phosphorous shows distinct tendency for catenation. Why?
2. N2 is a gas while P4 is a solid. Justify.
3. Give reason why PH3 is a weaker base than NH3.
4. On being slowly passed through water PH3 forms bubbles while NH3 dissolves. Why is it so?
5. The H-M-H bond angle in hydrides of gp 15th decreases down the group. The thermal stability of hydrides follows the same patter. Justify.
6. How does PCl5 exist in gaseous, liquid and solid state?
7. PCl5 fumes in air, why?
8. Both NCl5 and BiCl5 do not exist. Give reason.
9. Hypophosphorous and is monoprotic. Justify giving structure.
10. Give reason why phosphoric acid is diprotic while orthophosphoric acid is triprotic.
11. Metals like Cr and Al do not dissolve in concentrated nitric acid. Give reason.
12. What is the composition of complex formed at the junction of two solutions during ring test of NO 3
13. What is the gas present in smoke screens?
14. PCl5 is used as a chlorinating agent. Why?
15. Which elements are called “Chalcogens”? Why are they so called?
16. Name two toxic elements of gp 16.
17. Draw the cyclo – S6 allotrope of sulphur.
18. How does S occur in vapour phase at around 1000K?
19. SO2 is reducing while TeO2 is an oxidizing agent?
20. Give examples of neutral oxides.
21. Give equations to support amphoteric nature of Al2O3.
22. Ozone is the thermodynamically less stable than oxygen. Justify on basis of Gibb’s free energy change.
23. How is O3 gas estimated quantitatively?
24. SF6 doesn’t undergo hydrolysis. Justify.
25. Boiling points of gp16 element hydrides follow the order:-
H2 O >>> H2 S < H2 Se < H2 Te Explain
26. Enthalpy of dissociation of F2 is smaller than that of Cl2.Justify.
27. While preparing H2SO4 solution from concn H2SO4, what precaution must be taken and why?
28. pKa of HF (3.2) is higher than that of HCl (- 7.0) Explain.
29. Name the element used in flouroscent bulbs for advertisements / display purposes.
30. Why is NO2 coloured?
31. Despite lower Deg Hh F2 is a stronger oxidizing agent than Cl2. Why?
32. An inorganic lewis acid (x) shows following reactions:-
(a) It fumes in moist air.
(b) The intensity of fumes is increased if a rod dipped in NH4OH is brought near to it.
(c) An acidic solution of X on addition of NH4Cl / NH4OH gives ppt which dissolves in NH4OH,
no ppt with H2S. Identify X.
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CBSE Class 12 Chemistry Representative Elements Worksheet
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Worksheet for Chemistry CBSE Class 12 Representative Elements
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Representative Elements worksheet Chemistry CBSE Class 12
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Representative Elements CBSE Class 12 Chemistry Worksheet
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Worksheet for CBSE Chemistry Class 12 Representative Elements
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