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Reason: Ammonia solution turns blue litmus paper red.
                 Q.6 How chloride of lime differs from calcium chloride?                            [CBSE 2014]  1mark

              Q.7.The pH of a sample of vegetable soup was found to be6.5. How is this soup likely to
              taste?  [CBSE 2010]                                                                                                                     1 mark


               Q.8. Name the natural source of each of the following acid:                                            2 mark
                         a.   Citric acid,
                         b.   Oxalic acid,
                         c.   Lactic acid,
                         d.   Tartaric acid.                                                                            [CBSE 2014]

              Q.9 A compound ‘X’ of sodium is commonly used for making crispy pakoras. It is
              also used for curing acidity in the stomach. Identify ‘X’. Write the formula and its chemical
              name. State the reaction which takes place when it is heated.  [CBSE 2013, 2008(C)]    2mark


              Q.10.   Answer the following questions:                                                                                     3mark
                              a.   State  the  colour  of  phenolphthalein  in  soap solution.
                               b.   Name the by-product of chlor-alkali process which is used for the manufacture of
              bleaching powder.
                                                                                         +
                         c.   Name one indicator which specifies the various levels of H  ion
                 concentration. [CBSE 2016]

              W.11 You are provided with magnesium ribbon and sulphur powder. Explain with the help
              of activity that metal oxides are basic and oxides of non-metals are acidic in nature.
                     [CBSE 2014]                                                                                                                    3mark

              Q.12. a.   Tooth enamel is one of the hardest substance in our body. Explain the
              changes in pH of mouth which indicates tooth decay. How does tooth paste help in
              preventing it?

                        b.   What is the nature of salt if pH of its aqueous solution is greater than 7?
              Name the acid and base that would be used to prepare the following
                     salts:
                               (i) Potassium sulphate, (ii) Ammonium chloride   [CBSE 2012]             5 mark










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