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S.LNo.                                Questions                                Mark  Skill
               Q.1                                                                            1       R
                         Column II gives nature of acids and bases mention in column I,
                         match them correctly.


                              Cloumn I                 Cloumn II

                              (A)   HCl                (p)   strong acid
                              (B)   HCN                (q)   weak acid

                              (C)   NaOH               (r)    weak base
                              (D)   NH4OH              (s)   strong base

               Q.2                                                                            1       u
                         True/False:
                         There are a variety of strengths when you study acids and
                         bases.
               Q.3                                                                            3       R+A
                         What are strong and weak acids? In the following list of acids,
                         separate strong acids from weak acids. Hydrochloric acid, citric
                         acid, acetic acid, nitric acid, formic acid, sulphuric acid.
               Q.4                                                                            3       U+A
                         (a) Why does aqueous solution of an acid conduct
                         electricity?

                                                                       +
                         (b)  How  does  the  concentration  of  H 3O   ions  change
                                when a solution of an acid is diluted?

                         (c)  Which  one  has  a  higher  pH,  a  concentrated  or  a
                                dilute solution of hydrochloric acid?
               Q.5                                                                            5       HOT
                         a.   Define indicator. Name two indicators obtained from plants.
                         b. Write a balanced chemical equation for the reaction taking
                         place when sodium oxide reacts with water. How will this
                         solution behave towards phenolphthalein and red litmus
                         paper?
                         c. State what happens when  sodium  hydroxide solution reacts
                         with hydrochloric acid.
                         [CBSE 2016]

























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