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Q.

2Se2Cl2\rightarrow SeCl4 +3Se Ew of Se2Cl2 is

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a

2M/3

b

4M/3

c

M/8

d

M/4

answer is C.

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Detailed Solution

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\begin{array}{l} \mathop {S{e_2}}\limits^{ + 1} C{l_2} \to \mathop {Se}\limits^{ + 4} C{l_4} + 3\mathop {Se}\limits^0 \\\\ \underline {S{e_2}C{l_2}(Oxidant)} \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\underline {S{e_2}C{l_2}({\mathop{\rm Re}\nolimits} ductant)} \\ \,\mathop {S{e_2}}\limits^{ + 1} C{l_2} \to \mathop {Se}\limits^0 \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\mathop {S{e_2}}\limits^{ + 1} C{l_2} \to \mathop {Se}\limits^{ + 4} C{l_4} \end{array}

Total decrease in                                        Total increase in ox.state/mole = 2x3=6

ox.state/mole = 1x2=2                                 EW = M/6 

EW = M/2 

                    EW of \; Se_2Cl_2\; in\; the\; reaction = \frac{M}{2}+\frac{M}{6}

                                                                                   =\frac{4M}{6}=\frac{2M}{3}

Alternate method

2\mathop {S{e_2}}\limits^{ + 1} C{l_2} \to \mathop {Se}\limits^{ + 4} C{l_4} + 3\mathop {Se}\limits^0

Total increase in ox.state/ 2 moles = 3

Total decrease in ox.state/ 2 moles = 3

\therefore\;EW\;of\;Se_2Cl_2=\frac{2M}{3}

 

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