Page 1 - 4. HOME ASSIGNMENT-(IONSPOSITIVE&NEGATIVE IONSCALCULATION OF VALENCY OF IONS)
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SAI International School
                                                Subject-Chemistry

                                            Ch-Atoms and Molecules
                 Topic-Ions (positive ion and negative ion), calculations of valency
                                                        of ions

                                               HOME ASSIGNMENT
               OBJECTIVE QUESTIONS
           Q.1      Assertion:  The valency of ferrous ion is 2.
                    Reason: Ferrous ion is formed from neutral iron atom by loss of 2 electrons
                                                                                  +
           Q.2      Assertion: The formula ion formed from chlorine atom is Cl .
                    Reason: Chlorine can gain one electron.
           Q.3      Assertion: Calcium atom has two electrons in the valence shell.
                                                                2+.
                    Reason: The formula of calcium ion is Ca
                                                                             +
           Q.4      Assertion: Ammonium ion can be represented as NH4 .
                    Reason: It is a cation.
           Q.5      Which of the following is a polyatomic ion?
                    a) Ammonium ion
                    b) Sulphide ion
                    c) Carbide ion
                    d) Magnesium ion
           Q.6      The formula for sodium ion is
                               +
                        a)  Na
                               -
                        b)  Na
                        c)  Na
                               2+
                        d)  Na
                               2-
           Q.7      The valency of sulphate ion is:
                        a)  2
                        b)  2-
                        c)  2+
                        d)  0
           Q.8      Which of the following is a cation?
                         a) Sulphate ion
                         b) Chloride ion
                         c) Phosphate ion
                         d) Magnesium ion


               SUBJECTIVE QUESTIONS

           S.LNo.  Questions                                                                  Mark    Skill
           Q.1       What is meant by the valency of an element?                              1       E/U

           Q.2       What is the formula for ammonium ion?                                    1       Av/U

           Q.3       a) What are cations?                                                     3       Av/R
                     b)  Write the symbols for the following ions
                     i) Magnesium ion



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