Usha Martin World School, Patna
Session: 2016-17
QUESTION BANK
Class: X
Sub. : CHEMISTRY
All questions are compulsory.
Q1 What are isomers? Why can’t we have isomers of first three members of alkane series ? Draw the possible
structures of isomers of butane, C4H10.
Q2 Write the chemical equations to show what happens when
(i) An ester reacts with a base?
(ii) Methane is treated with chlorine in the presence of sunlight?
(iii) Ethanol reacts with ethanoic acid in the presence of sulphuric acid?
Q3 What are groups and periods in the periodic table? Two elements X and Y belong to group 1 and 2 respectively
and are in the same period of the periodic table. How do the following properties of X and Y vary?
(i) Size of their atom
(ii) Their metallic character
(iii) Their valencies in forming oxides
(iv) Molecular formula of their chlorides
Q4. What are hydrocarbons? Distinguish alkanes from alkenes and each of them from alkynes, giving one example of
each. Draw the structure of each compound cited as example to justify your answer.
Q5. Elements forming ionic compounds attain noble gas configuration by either gaining or losing electrons from their
outermost shells. Give reason to explain why carbon cannot attain noble gas configuration in this manner to form its
compounds. Name the type of bonds formed in ionic compounds and in the compounds formed by carbon. Also give
reason why carbon compounds are generally poor conductors of electricity.
Q6. What are homologous series of carbon compounds? Write the molecular formula of two consecutive members
of homologous series of aldehydes. State which part of these compounds determines their (i) physical and (ii)
chemical properties. What are homologous series of carbon compounds ? Write the molecular formula of two
consecutive members of homologous series of aldehydes. State which part of these compounds determines their (i)
physical and (ii) chemical properties.
Q7. A carboxylic acid (molecular formula C2H4O2) reacts with an alcohol in the presence of an acid catalyst to form a
compound ‘X’. The alcohol on oxidation with alkaline KMnO4 followed by acidification gives the same carboxylic acid
C2H4O2. Write the name and structure of (i) carboxylic acid, (ii) alcohol and (iii) the compound ‘X’.
Q8. The electrons in the atoms of four elements A, B, C and D are distributed in three shells having 1, 3, 5 and 7
electrons in the outermost shell respectively. State the period in which these elements can be placed in the modern
periodic table. Write the electronic configuration of the atoms of A and D and the molecular formula of the
compound formed when A and D combine.
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Q9. Name the functional group of organic compounds that can be hydrogenated. With the help of suitable example
the process of hydrogenation mentioning the condition of the reaction and any one change in physical property with
the formation of the product. Name any one natural source of organic compounds that are hydrogenated.
Q10. Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electronic shells but different
number of electrons in their outermost shell. It was found that elements A and G combine to form an ionic
compound. This compound is added in a small amount to almost all vegetable dishes during cooking. Oxides of
elements A and B are basic in nature while those of E and F are acidic. The oxide of D is almost neural. Based on the
above information answer the following questions :
(i)
To which group or period of the periodic table do the listed elements belong?
(ii)
What would be the nature of compound formed by a combination of elements B and F?
(iii)
Which one of the eight elements is most likely to be found in gaseous state at room temperature?
(iv)
Which two of these elements could definitely by metals?
(v)
If the number of electrons in the outermost shell of elements C and G 3and 7 respectively, write the
formula of the compound formed by the combination of C and G.
Q11. Write the names and symbols of two most reactive metals belonging to group I of the periodic table. Explain by
drawing electronic structure how either one of the two metals reacts with a halogen. With which names the bond
formed between these elements known and what is the class of the compound so formed known ? State any four
physical properties of such compounds.
Q12. Explain the formation of scum when hard water is treated with soap.
Q13. Draw the electron dot structures for
(a) ethanoic acid.
(b) H2S.
(c) propanone.
(d) F2
Q14. People use a variety of methods to wash clothes. Usually after adding the soap, they ‘beat’ the clothes on a
stone, or beat it with a paddle, scrub with a brush or the mixture is agitated in a washing machine. Why is agitation
necessary to get clean clothes?
Q15. Draw the structures for the following compounds.
(i) Ethanoic acid (ii) Bromopentane
(iii) Butanone (iv) Hexanal
Q16. A mixture of oxygen and ethyne is burnt for welding. Can you tell why a mixture of ethyne and air is not used?
Q17. Compare and contrast the arrangement of elements in Mendeléev’s Periodic Table and the Modern Periodic
Table.
Q18. In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12,
19, 21 and 38. Which of these have physical and chemical properties resembling calcium?
Q19. Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table.
Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
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Q20. Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
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