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SUBJECTIVE:

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


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

               Q.3     A substance ‘X’ is usedas  antacid  reacts  with hydrochloric acid     3       R+A
                       to produce a gas W which is used infire 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 relieveindigestion in
                      stomach?
                      (ii)   Afarmer     treats   the    soil   with    quicklime    or
                      calcium carbonate. What is the nature of thesoil? Why does
                      the farmer treat the soil with quicklime? [CBSE 2012]

























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