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Friday, October 28, 2011

Xth Chemistry - Carbon and its Compounds (Sample Board Guess Questions paper)

1 mark questions:-
1. Name the type of bond formed when sharing of electrons occurs.
2. How many valence electrons are there in valence shell of carbon atom?
3. Define catenation.
4. What do you understand by unsaturated 
compounds?
5. Why are unsaturated hydrocarbons more reactive  than saturated hydrocarbons?

6. What is the difference in number of carbon and hydrogen atoms between two successive members of a homologous series?
7. What is the difference in molecular masses of any two successive homologues?
8. Name the functional group present in following compounds:-
(i) C2H5OH (ii) CH3COC2H5
9. Give the IUPAC name of the following compounds.
(a) CH3 −CH2 −Cl
(b)   H C = O
              I
            H
10. Substitution reactions are given by which type of hydrocarbons?
11. Name the type of hydrocarbon taking part in an addition reaction.
12. Name the products obtained from the complete combustion of saturated hydrocarbon.
13. Acetic acid is also known as glacial acid. Why?
14. Which gas evolved when sodium carbonate reacts with ethanoic acid?
15. Name the catalyst commonly used in the process of conversion of vegetable oils into fats.
16. Write the colour of flame produced by unsaturated hydrocarbons on complete combustion.
17. Which acid is regarded as dehyderating agent?
18. What are hetro atoms? Give one example.

2 marks questions:-

19. Draw electron dot structure of CH4 and O2.
20. What is a homologous series? Write two main features of homologous series.
21. Explain why saturated hydrocarbons give sooty flame on incomplete combustion?
22. Differentiate between saturated and unsaturated hydrocarbons giving one example of each.
23. Which of the following hydrocarbons undergoes addition reactions & why :-
C2H6, C2H2, C3H8, C3H6
24. Write the chemical formula and structural formula of:- (i) Benzene  (ii) Propanoic acid
25. Write names of following compounds as per nomenclature:-
(i) CH3CH2COOH (ii) CH3CH2COCH
26. What are structural isomers? How many structural isomers can you draw from Pentane?
27. What is hydrocarbon? Write the general formula of the hydrocarbons :-
(i) Alkane (ii) Alkene (iii) Alkyne
28. What happens when a piece of sodium is dropped into a test tube containing ethanol? Write the chemical equation also.

29. A hydrocarbon compound A is active ingredient of wine and cough syrups. A on oxidation with acidified K2Cr2O7 forms compound B. Identify the compound A and B and write the chemical equations involved.
30. What is hydrogenation? Write its industrial application.
31. Which type of reaction takes place when saturated hydrocarbons react with chlorine in presence of sunlight? Write the chemical equation if the saturated hydrocarbon is methane(CH4).
32. What is scum? How is it formed?
33. A, B and C are members of a homlogous series, there melting points are–1830  C,–1380 and  –1300 C respectively. Among these:-
(i) Which member will have least number of carbon atoms?
(ii) Which member will have maximum number of carbon atoms?
34. What are esters? How are they formed?
3 marks questions:-

35. Write the chemical formula and structure of the following:-
(i) Cyclohexane (ii) Propanal (iii) Chlorobutane
36. Draw the electron dot structure of the following:-
(i) C2H6 (ii) C2H4 (iii) C2H2
37. Giving chemical equations of the reactions write what happens when:-
(i) Ethanol is heated at 443K with excess of concentrated sulphuric acid.
(ii) Conversion of oils (unsaturated hydrocarbon) into fats (saturated hydrocarbons)
(iii) Ethanoic acid reacts with sodium hydroxide.
38. Draw three structural isomers butane.
39. Explain formation of micelles with the help of suitable diagram?
40. Explain the following terms with related chemical equations:-
(i) Dehydration
(ii) Esterification
(iii) Saponification
41. Soap does not work effectively in hard water. Explain why?
42. How can you obtain the following from pure ethanol :-
(i) Ethene
(ii) Ethanoic acid
(iii) Ester
Write the chemical equations of the reactions.
43. Distinguish between addtion and substitution reactions with suitable examples.
44. Differentiate between ethanol and ethanoic acid on basis of following test:-
(i) Blue litmus test
(ii) Reaction with sodium bicarbonate
(iii) Sodium metal test.
45. Give reasons for the following observations :–
(i) The element carbon forms a very large number of compound.
(ii) Air holes of a gas burner have to be adjusted when the heated vessels get blackened
by the flame.
(iii) Use of synthetic detergents cause pollution of water.
46. What is the difference between combustion and oxidation?
Under what condition an oxidation reaction can be cancelled as combustion? [Illustrate your answer with one example each.]
5 marks questions:-

47. What are soaps? Explain the mechanism of the cleaning action of soaps?
48. Soaps form  scum (insoluble substance) with hard water. Explain why? How this problem is overcome  by use of  detergents?
49.Give one example of each of the following :–
(a) A carbon compound containing two double bonds.
(b) A molecule in which central atom is linked to three, other atoms.
(c) A compound containing both ionic and covalant bonds.
(d) An organic compound which is soluble in water.
(e) A carbon compound which burns with a sooty flame.
50. Why is the conversion of ethanol to ethanoic acid considered an oxidation reaction?  [2011 (T-II)]

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