11th Class Chemistry The s-Block Elements

  • question_answer 78)   In the following questions more than one option of column I and column II may be correlated: Match the elements given in column I with the properties mentioned in column II.  
    Column I Column II
    (i)   \[Li\]   (a)   Insoluble sulphate  
    (ii)   \[Na\]   (b)   Strongest mono acidic base  
    (iii) \[Ca\] (c)   Most negative \[{{E}^{{}^\circ }}\] value   among alkali metals
    (iv) Ba (d)   Insoluble oxalate  
        (e)   \[6{{s}^{2}}\]outer electronic configuration

    Answer:

      (i?c, d), (ii?b), (iii?d), (iv?a, e) Lithium has the most negative \[E{}^\circ \]value, i.e., - 3.04. Its oxalate is insoluble in water. Amongst the hydroxides, \[LiOH,\text{ }NaOH,\text{ }Ca{{(OH)}_{2}}\]and\[Ba{{(OH)}_{2}}\], the strongest mono acidic base is\[NaOH\]. Calcium oxalate is insoluble in water. Barium sulphate is insoluble in water. The outermost electronic shell of Ba has\[6{{s}^{2}}\] configuration. \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{10}}4{{s}^{2}}4{{p}^{6}}4{{d}^{10}},5{{s}^{2}}5{{p}^{6}},6{{s}^{2}}\]

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