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Q.3    Define ionic compounds? Ionic compounds conduct electricity only in the       3    R+A
                     molten state & not in solid state. Why? [CBSE 2010,2012]

              Q.4    Give reasons for the following :                                              3    U+A


                     (i) Ionic compounds have high melting point and boiling point.

                     (ii) Ionic compounds conduct electricity in molten state.

                     (iii) Ionic compounds are solids at room temperature and are somewhat
                     hard.                                                       [CBSE 2008]


              Q.5    (a) In the formation of compound between two atoms A and B, A loses           5    HOT

                     two electrons and B gains one electron.

                       (i)   What is the nature of bond between A and B ?

                       (ii)   Suggest the formula of the compound formed between A and B.

                     (b) On similar lines explain the formation of Mg Cl2 molecule.

                     (c) Common salt conducts electricity only in the molten state.  Why ?

                     (d) Why is melting point of NaCl high ?



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