Carbon and its Compounds-Sample Questions

Class X Science
Sample Paper for Carbon and its Compounds
1.   (a) Complete the following equations:
        (b) Write the name of the following:
               (i) CH3CH2COOH (ii) CH3CH2Br
        (c) Draw the electron dot structure of ethene (C2H4).
(CBSE 2008 C)
2.   (a) Name the compound CH3CH2OH and identify its functional group.
        (b) Give a chemical test to distinguish between ethanol and ethanoic acid.
        (c) Name the product formed when an organic acid reacts with an alcohol in presence of an acid catalyst. What is the name assigned to this type of reaction?
(AI CBSE 2008 C)
3.   (a) Name the compound CH3COOH and identify its funcational group.
        (b) Give a chemical test to identify this compound.
        (c) Name the gas evolved when this compound acts on solid sodium carbonate. How would you identify this gas?
4.   (a) Give a chemical test to distinguish between saturated and unsaturated hydrocarbons.
        (b) (i) Name the products formed when ethanol burns in air.
               (ii) What two forms of energy are liberated on burning alcohol?
        (c) Why is the reaction between methane and chlorine considered a substitution reaction?
(AI CBSE 2008 C)
5.   Give reason for the following observations:
        (a) The element carbon forms a very large number of compounds.
        (b) Air holes of a gas burner have to be adjusted when the heated vessels get blackened by the flame.
        (c) Use of synthetic detergents causes pollution of water. (CBSE 2009)
6.   (a) What is vinegar?
        (b) Describe with a chemical equation, what happens when sodium hydrogen carbonate reacts with ethanoic acid.
7.   (a) Write the names of the functional groups in:
        (b) Describe a chemical test to distinguish between ethanol and ethanoic acid.
        (c) Write a chemical equation to represent what happens when hydrogen gas is passed through an unsaturated hydrocarbons in the presence of nickel as a catalyst.
(CBSE 2009 F)
8.   (a) Why does carbon form compounds mainly by covalent bonding?
        (b) List any two reasons for carbon forming a very large number of compounds.
        (c) An organic acid ‘X’ is a liquid which often freezes during winter time in cold countries, has the molecular formula, C2H4O2. On warmong it with ethanol in the presence of a few drops of concentrated sulphuric acid, a compound ‘Y’ with a sweet smell is formed.
               (i) Identify ‘X’ and ‘Y’.
               (ii) Write a chemical equation for the reaction involved. (CBSE 2008)
9.   (a) What is homologous series of compounds? List any two characteristics of a homologous series.
        (b) (i) What would be observed on adding 5% solution of alkaline potassium permanganate solution drop by drop to some warm ethanol taken in a test tube?
               (ii) Write the name of the compound formed during the chemical reaction.
        (c) How would you distinguish experimentally between an alcohol and a carboxylic acid on the basis of a chemical property?
(CBSE 2008)
10.   (a) What is a functional group in a carbon compound? Identify the functional group present in CH3COOH and C2H5OH.
        (b) State the principle on which the cleansing action of soap is based.
(CBSE 2008)
11.   (a) What is homologous series? Give one example.
        (b) What will happens if ethanoic acid reacts with ethanol in the presence of an acid as a catalyst?
        Name the reaction. Write the chemical reaction for this reaction.
        (c) Why are soaps ineffective in hard water?
(CBSE 2008 C)
12.   (a) Distinguish between esterification and saponification reactions of organic compounds.
        (b) With a labelled diagram describe an activity to show the formation of an ester.
(AI CBSE 2009)
13.   (a) The structural formula of an ester is
               Write the structural formula of the corresponding alcohol and the acid.
        (b) (i) Mention the experimental conditions involved in obtaining ethene from ethanol.
               (ii) Write the chemical equation for the above reaction.
        (c) Explain the cleansing action of soap.
(CBSE 2009 F)