DPS MODERN INDIAN SCHOOL, DOHA, QATAR
QUESTION BANK
CLASS X SUBJECT: CHEMISTRY
Topic: Carbon and its compounds.
Q1. What is Soap? How is it different from detergents?
Q2. Why are covalent compounds poor conductors of electricity?
Q3. Explain why large number of carbon compounds exists.
Q4. Write one reaction which is shown by both alcohols and carboxylic acids.
Q5. Why are unsaturated hydrocarbons more reactive than saturated hydrocarbons?
Q6. Differentiate between absolute alcohol and denatured alcohol.
Q7. Draw the structure of butanoic acid and cyclopentane.
Q8.What happens when
a. Ethanol burns in air?
b. Ethanol reacts with sodium metal.
c. Ethanol is oxidized with chromic anhydride in glacial ethanoic acid.
d. Ethanol is heated with alkaline potassium permanganate.
e. Ethanol is heated with ethanoic acid in the presence of few drops of
concentrated sulphuric acid.
f. Mixture of methane and chlorine gas is kept in Sunlight.
Q9. Give reason why unsaturated hydrocarbons burn with sooty flame?
Q10. Explain the following terms:
a. Esterification
b. Saponification
c. dehydration
d. Hydrogenation
Q11.Write the electron dot structure of
Cl2, O2 HCl, CO2 and NH3
Q12. Write the formula and the structure for the following compounds:
a. Chloropropane
b. Propene
c. Propyne
d. Propanol
e. Propanal
f. Propanone
g. Propanoic acid
h. Benzene
13. An organic compound A has molecular formula C2H4O2 and acidic in nature. On
heating with ethanol and conc.sulphuric acid, vapours with pleasant smell are given out.
What are compound A and the chemical equation involved in this reaction?
14. An organic compound X that is sometimes used as antifreeze has the molecular
formula C2H6O.X on oxidation gives a compound Y, which gives brisk effervescence with
baking soda solution. What can X and Y may be .Write their structural formulae.
15. Draw structures of
a) Butanoic acid
b) Butanone
c) Cyclo pentane
d) Chloro propane e) Cyclobutane f) Benzene
16. Why does CCl4 not conduct electricity?
17. Give an example of a molecule with double and triple bond.
18. NaCl is soluble in water but CCl4 is not why?
19. Write IUPAC name of (a) CH3COOCH3 (b) C2H5Cl.
20. Select the hydrocarbons of the same homologous series. Give the name of each
series and also the compound.
C 3H8 , C 4H 10 , C 5H 10 , C6 H10 , C7 H12 , C8 H 16
21. Draw the structure of butanoic acid and cyclopentane.
22. What is an oxidising agent? Name two oxidising agent which can oxidise ethanol to
ethanoic acid.
23. An organic compound X of molecular formula C2H4O2 gives brisk effervescence with
sodium hydrogen carbonate. Give name and formula of X. Give equation also.
24. Name the following compounds.
CH3-CH2-Br
CH3-CH2-CH2-CH=CH2
25. An organic compound ‘A’ is widely used as a preservative in pickles and has a
molecular formula C2H4O2. This compound reacts with sodium carbonate to give carbon
dioxide gas. Identify the compound ‘A’. Write the chemical equation for the above
reaction.
26. Write one reaction which is common to both Ethanol and ethanoic acid and one
reaction to differentiate them?
27. What is the main difference between saturated and unsaturated hydrocarbons?
Which of these two is more reactive and why?
28. Draw electron dot structure of
(i)
CH4
(ii)
CCl4
(iv)
N2
(v)
H2O
(iii)
O2
29. Define Allotropes. Name the three Allotropes of carbon.
30. Write two points of difference in the structure of diamond and graphite.
31. Identify alkene and alkyne and alkane from the following.
C2H6,
C2H2,
C3H4,
CH4,
C3H6,
C4H6,
C4H8,
C3H8,
32. How do we prove that ethanoic acid is a weak acid?
33. Draw electron dot diagram of ethane, ethene and ethyne.
34. What happens when
a) Ethanol on combustion
b) Ethanol on oxidation with alkaline KMnO4
c) Ethene on hydrogenation with palladium catalyst.
35. What is meant by denatured spirit?
Topic: Periodic Classification of Elements
Q1. State Mendeleev’s Periodic law
Q2. Define group and period
Q3. Name the elements present in the 17 th group.
Q4. Which period is the longest period in the modern periodic table?
Q5. How many groups are there in the long form of the periodic table?
Q6. How many horizontal rows are there in the modern periodic table?
Q7. Where would you expect to find the element with atomic number
12 in the periodic table and why?
Q8. What does each group in the periodic table signify?
Q9. Why do group one elements form unipositive ions?
Q10. What are isotopes and isobars? Give examples
Q11. How does the metallic character change along the period?
Q12. Explain why potassium is more reactive than sodium?
Q13. What do you understand by the term ‘atomic size’? Discuss the variation in the
periodic table.
Q14. What type of ions are formed by group 1 and group 16 elements?
Q15. Why does the size of the atom increase down the group?
Q16. State Newland’s law of octaves.
Q17. Give three sets oh elements which are considered as Dobereiner’s triads.
Q18. What are the limitations of law of octaves?
Q19. Discuss the merits and demerits of Mendeleev’s periodic classification.
Q20. Why is that the valency of elements in a group is same? Give reason.