MCQ
The radium of an atom is about
- Athe same as the volume of its nucleus
- Bfour times the radius of its nucleus
- ✓$10,000$ times the radius its nucleus
- D$10^{12}$ times the radius of its nucleus
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$aCr _2 O _7^{2-}+ bSO _3^{2-}( aq )+ cH ^{+}( aq ) \rightarrow 2 aCr ^{3+}( aq )+ bSO _4^{2-}( aq )+\frac{ c }{2} H _2 O ( l )$
the coefficients a, b and $c$ are found to be, respectively-