AKR ACADEMY SCHOOL (CBSE)

AVINASHI -TIRUPUR

REVISION TEST
Class 10 - Science
Time Allowed: 2 hours Maximum Marks: 60

1. i. Why does carbon form the largest number of compounds? Give two reasons. [1]
ii. Why are some of these called saturated and the other unsaturated compounds?
iii. Which one of these two is more reactive and why?
2. Two carbon atoms cannot be linked to each other by more than three covalent bonds. Why? [1]
3. What are the properties of carbon which lead to huge number of carbon compounds we see [1]
around us?
4. Name two forms of alcohol which are poisonous. [1]
5. Draw the electron dot structures for: [1]
a. Ethanoic acid
b. H2S

c. Propanone
d. F2

6. Catenation is the ability of an atom to form bonds with other atoms of the same element. It is [1]
exhibited by both carbon and silicon. Compare the ability of catenation of the two elements.
Give reasons.
7. Write the structural formula and IUPAC name of the following: [1]
i. A carboxylic acid with four C-atoms.
ii. An alkyne with three C-atoms.
iii. An alcohol having one C-atom.
8. Why are carbon and its compounds used as fuels for most applications? [1]
9. How many structural isomers can you draw for pentane? [1]
10. Draw the structures of the following compounds: [1]
a. Ethanoic acid
b. Bromopentane
c. Butanone
11. How do alcohols differ structurally from alkanes? [1]
12. Unsaturated hydrocarbons contain multiple bonds between the two C-atoms and show [1]
addition reaction. Give the test to distinguish ethane from ethene.
13. Out of two compounds, ethane and ethene which is more reactive? Give reason. [1]
14. Draw the electron dot structures for : ethanoic acid [1]
15. Name an element, other than carbon, which exhibits the property of catenation upto seven or [1]
eight atoms. Are these compounds stable?
16. Write the structures of: [1]

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AKR ACADEMY SCHOOL (CBSE)- AVINASHI
 i. Ethanoic acid
ii. Hexanal
17. Draw the electron dot structure of ethyne, also draw its structural formula. [1]
18. How many electrons are shared by each atom in the formation of [1]
(i) a double bond and
(ii) a triple bond?
19. How would you name the following compounds? [1]
i. CH3-CH2 -Br

ii.

iii.

20. What would be the electron dot structure of a molecule of sulphur which is made up of eight [1]
atoms of sulphur? (Hint – The eight atoms of sulphur are joined together in the form of a
ring.)
21. Draw the electron dot structures for : Propanone [1]
22. List two characteristics of covalent compounds. [1]
23. What would be the electron dot structure of a molecule of sulphur which is made up of eight [1]
atoms of sulphur?
24. Give three characteristic properties of covalent compounds. [1]
25. What will be the formula and electron dot structure of cyclopentane? [1]
26. Mention four differences between saturated and unsaturated hydrocarbons. [1]
27. The molecular formula of A is C10 H18and B is C18H36. Name the homologopus series to which [1]
they belong.
28. A mixture of oxygen and ethyne is burnt for welding. Can you tell why a mixture of ethyne [1]
and air is not used?
29. Diamond is a poor conductor of electricity while graphite is a good conductor. Give reason. [1]
30. Give the name and the formula of a compound having one double bond and four single bonds. [1]
31. What happens when a molecule of hydrogen is added to ethyne? Explain. [1]
32. Complete the following reactions: [1]
H3 P O4

i. H2 C = C H2 + H2 O −−−−→

ii. HC ≡ CH + Br2 →

iii. C2 H5 OH + N a →
33. Explain the Saponification reaction with the examples. [1]
34. Give names of the following: [1]
(a) An aldehyde derived from ethane
(b) Ketone derived from butane
(c) Compound obtained by the oxidation of ethanol by chromic anhydride
35. Why conversion of ethanol into ethanoic acid is an oxidation reaction? [1]
36. What is an homologous series? Explain with an example. [1]
37. How will you bring about the following conversions: Ethanoic acid to ethanol ? [1]

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AKR ACADEMY SCHOOL (CBSE)- AVINASHI
38. Write the formula for the functional groups of alcohols and carboxylic acids. [1]
39. Name the following compounds. [1]
i. CH3—CH2—Br
H

ii. H − C = O
H H H H

| | | |

iii. H − C − C − C − C − C = C− H
| | | |
H H H H

40. Justify the nature of physical and chemical properties of compounds of homologous series. [1]
41. " Saturated hydrocarbons burn with a blue flame while unsaturated hydrocarbons burn with [1]
a sooty flame". Why?
42. A compound has the formula H2Y (Y=non-metal). State the following: [1]

i. The outer electronic configuration of Y.

43. How would you distinguish experimentally between an alcohol and a carboxylic acid? [1]
44. i. Write the formula and draw the electron dot structure of carbon tetrachloride. [1]
ii. What is saponification? Write the reaction involved in this process.
45. What would be the electron dot structure of carbon dioxide which has the formula of CO2? [1]
46. Explain the mechanism of cleaning action of soap. [1]
47. Draw the electron dot structures of the given compound and state the type of bonding : HCl [1]
48. An organic acid X is a liquid which often freezes during winter time in cold countries. It has [1]
molecular formula C2H4O2. On warming with ethanol in the presence of a few drops of conc.
H2SO4,a compound Y with sweet smell is formed.

i. Identify X and Y.
ii. Write the chemical equation for the reaction involved.
49. Explain the oxidation reaction with the examples. [1]
50. What are the two properties of carbon which lead to the large number of carbon compounds [1]
we see around us?
51. Draw the structures of the following compounds: Hexanal [1]
52. Draw the structures of the following compounds: Bromopentane [1]
53. Which organic compound is added to make ethanol unfit for drinking purposes? What is the [1]
name of the mixture formed?
54. Apart from the organic compounds, where else do we find carbon? [1]
Mention the form in which it is available there and also its percentage.
55. In electron dot structure, the valence shell electrons are represented by crosses or dots. [1]
i. The atomic number of chlorine is 17. Write its electronic configuration.
ii. Draw the electron dot structure of chlorine molecule.
56. Out of sodium chloride (NaCl) or methyl chloride (CH3 Cl), which has higher melting and [1]

boiling points? Why?

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58. What are soaps chemically? How do they differ from synthetic detergents? Also, mention their [1]
uses?
59. Ethyl ethanoate smells like pears and is used for flavouring sweets. [1]
i. Write the chemical formula of ethyl ethanoate.
ii. Write the chemical reaction between ethanoic acid and ethanol in the presence of
concentrated sulphuric acid.
iii. Suggest the function of concentrated sulphuric acid in the reaction.
60. Write the two possible compounds of molecular formula C3H6O. [1]

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