1.

In the following reaction \[_{12}M{{g}^{24}}{{+}_{2}}H{{e}^{4}}{{\to }_{14}}S{{i}^{X}}{{+}_{0}}{{n}^{1}},X\]is        [SCRA 1994]

A.            28  
B.            27
C.            26  
D.            22
Answer» C.            26  


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