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SUBJECTIVE:

                 S.L                                 Questions                                 Mark  Skill
                 No.
                 Q.1                                                                           1       R
                        Write the chemical name and chemical formula of washing soda.
                                  [CBSE 2014]


                 Q.2                                                                           1       u
                        Name the chemicals used in acid fire extinguisher and the gas
                        evolved from it when it is used?                      [CBSE 2012, 2011]

                 Q.3    A substance ‘X’ is used   as   antacid   reacts   with hydrochloric    3       R+A
                        acid to produce a gas W which is used in fire extinguishers:
                           a.   Name the substance X and ‘Y’.
                           b.      Write  a  balanced  equation  of  the  reaction  between
                               X and hydrochloric acid.                        [CBSE 2013]

                 Q.4                                                                           3       U+A
                        “Sodium  hydrogen  carbonate  is  a  basic  salt.”  Justify
                        the  statement.  How  is  it  converted  into  washing  soda?
                        Explain.                                           [CBSE2012]

                 Q.5    a. A metal compound ‘X’ reacts with dilute H2SO4 to   produce          5       HOT
                        effervescence.   The   gas   evolved extinguishes a burning
                        candle. If one of the compound formed is calcium sulphate, then
                        what is ‘X’ and the gas evolved? Also write a balanced chemical
                        equation for the reaction which has occurred.
                        b. (i) Name one antacid. How does it help to relieve indigestion in
                        stomach?
                        (ii)  A  farmer  treats  the  soil  with  quicklime  or
                        calcium carbonate. What is the nature of the soil? Why does
                        the farmer treat the soil with quicklime?                 [CBSE 2012]


























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