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SAI International School
                                                  Subject-Chemistry

                                                           Cl-X
                Ch-1(Full) , Ch- 2(Full) , Ch-3(Full) & Ch-4 (covering module_31 to 33)
                                                     Worksheet: 11

               Q1. A reddish brown coloured metal used in electric wires,when powdered
               and heated strongly in an open China dish, its colour turns black. When
               hydrogen gas is passed over this black substances, it regain its original
               colour. Based on this information, the metal and black coloured substances
               are                                                                                [  A+D ] (1mark)
               (a) copper and copper nitrate (b) silver and silver oxide    (c) copper and
               copper oxide   (d) aluminium and aluminium oxide

                Q2. .Name the acid present in the following:
                (i) Tomato (ii) Vinegar                                                             [  R+E ] (1mark)


               Q3. Choose strong acids from the following:
               CH 3COOH, H 2SO 4, H 2CO 3, HNO 3                                   [U+Av ] (1mark)

               Q4.Equal length of magnesium ribben are taken in two test tubes ‘A’ and ‘B’. H 2SO 4 is
               added to test tube ‘A’ and H 2CO 3 in the test tube ‘B’ in equal amounts:
               (a) Identify the test tube showing vigorous reaction
                (b)Name the gas liberated in both the tubes.                  [  A+Av ] (1mark)


               Q5. State two characteristic features of carbon which when put together give rise to
               large  number of carbon compounds.                   [  U+Av ] (1mark)


               Q.6.What is meant by a functional group in an organic compound? Name the functional
               group present in
               (i) CH 3CH 2OH
               (ii) CH 3COOH                                               [ A+Av ] (3mark)

               Q.7. (a)Write the name and formula of the 2nd member of the series of carbon
               compounds whose general formula is C nH 2n+1OH
               (b) write the name and general formula of (i) saturated hydrocarbons, (ii) unsaturated
               hydrocarbons                                                         [  A+Av ] (3mark)


                Q.8. Write the names and molecular formula of two organic compounds having
                functional group suffixed as ‘-oic acid’. With the help of a balanced chemical equation
                and explain what happens when any one of them reacts with sodium hydroxide.
                                                                                    [  A+Av ] (3mark)


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