CBSE Guess > Papers > Important Questions > Class XII > 2008 > Chemistry > Chemistry By Mr. S.Vasu

Chemistry

Q. 1. Draw the resonating structures of

1. NO
2. NO₂
3. N₂O
4. N₂O₃
5. N₂O₄
6. N₂O₅.
7. O₃.

Also draw the structures of each clearly depicting the bond parameters.

Q. 2. Draw the resonance structures of SO₂.

Q. 3. Draw the structures of

1. NH₃
2. HNO₃
3. White phosphorus
4. Red phosphorus
5. PCl₃
6. PCl₅
7. Phosphoric acid
8. Phosphorus acid
9. Hypo phosphorus acid
10. Pyro phosphoric acid
11. cyclic tri meta phosphoric acid
12. Poly meta phosphoric acid.
13. S₈
14. S₆
15. Sulphuric acid
16. sulphurus acid
17. Peroxo di sulphuric acid
18. Pyro sulphuric acid (oleum)
19. HOCl
20. HClO₂
21. HClO₃
22. HClO₄
23. BrF₃
24. IF₅
25. IF₇
26. IF₄- aa) SF₄ bb) SF₆ cc) XeOF₄ dd) BrO₃- ee) XeF₂ ff) XeF₄ gg) XeF₆ hh) XeOF₄ ii) XeO₃

Q. 4. Give the formula and structure of noble gas species which is iso structural with

1. ICl₄-
2. IBr₂-
3. IF₆-
4. BrO₃-

Q. 5. Why does nitrogen shows anomalous behavior? Give examples to show the anomalous behavior of nitrogen.

Q. 6. Why does oxygen shows anomalous behavior? Give examples to show the anomalous behavior of oxygen.

Q. 7. Why does fluorine shows anomalous behavior? Give examples to show the anomalous behavior of fluorine.

Q. 8. Describe the method of preparation of

1. NH₃ by Haber procssssess
2. HNO₃ by Ostwald process
3. H₂SO₄ by contact process.

Give three uses of each.

Q. 9. Explain brown ring test for nitrate with suitable equations.

Q. 10. What is disproportionation reaction? Give equation of the reactions involved in the disproportionation of

1. HNO₂
2. Se₂Cl₂
3. H₃PO₂

Q. 11. How is ozone estimated quantitatively?

Q. 12. Give two uses each of

1. N₂
2. PH₃
3. O₂
4. Ozone
5. SO₂
6. Cl₂
7. ClO₂
8. BrO₃
9. I₂O₅
10. Cl₂ k) HCl
11. ClF₃
12. He
13. Ne
14. Ar
15. Kr
16. Xe

Q. 13. How is NH₃(aq) used in salt analysis to determine the presence of

1. Fe³⁺
2. Zn²⁺
3. Ag⁺

in salt analysis. Write the equations of the reactions involved.

Q. 14. How is the presence of SO₂ detected?

Q. 15. What is aqua regia? How does it dissolve noble metals like Au and Pt? Write the equations of the reactions involved.

Q. 16. Give differences between white phosphorus and red phosphorus.

Q. 17. How is

1. N₂
2. O₂
3. Cl₂ prepared in the laboratory? Write the equations of the reactions involved.

Q. 18. How is

1. N₂
2. O₂
3. Cl₂ manufactured in the industry? Write the equations of the reactions involved in the manufacture of Cl₂.

Q. 19. How is ammonia prepared in laboratory? Write the equation of the reaction involved.

Q. 20. How is HNO₃ prepared in laboratory? Write the equation of the reaction involved.

Q. 21. How is phosphine prepared from

1. Calcium phosphide
2. White phosphorus.

Write the equations of the reactions involved.

Q. 22. How is PCl₅ prepared from

1. Cl₂
2. SO₂Cl₂?

Write the equations of the reactions involved

Q. 23. How is PCl₃ prepared from

1. Cl₂
2. SOCl₂?

Write the equations of the reactions involved

Q. 24. How is HCl prepared from NaCl? Write the equations of the reactions involved

Q. 25. Write the chemical formula of

1. Chile saltpetre
2. Indian saltpetre
3. Fluorapatite
4. Gypsum salt
5. Epsom salt
6. Baryte
7. Galena
8. Zinc blende
9. Copper pyrite
10. Florospar
11. cryolite
12. Fluoroapatite
13. carnalite.
14. Tear gas
15. mustard gas
16. Phosgene

Q. 26. With what neutral molecule ClO- is iso electronic? Is that molecule a lewis base?

Q. 27. Compare the chemistry of Sulphur.What is the transition temperature of Sulphur.

Q. 28. How is phosphine purified? Write the equations of the reactions involved.