A) \[\frac{molecular\text{ }weight}{2}\]
B) \[\frac{molecular\text{ }weight}{6}\]
C) \[\frac{molecular\text{ }weight}{3}\]
D) same as molecular weight
Correct Answer: B
Solution :
\[C{{r}_{2}}O_{7}^{2-}+14{{H}^{+}}+6{{e}^{-}}\xrightarrow{{}}2C{{r}^{3+}}+7{{H}_{2}}O\] \[6{{I}^{-}}\xrightarrow{{}}3{{I}_{2}}+6{{e}^{-}}\] \[2N{{a}_{2}}{{S}_{2}}{{O}_{3}}+{{I}_{2}}\xrightarrow{{}}N{{a}_{2}}{{S}_{4}}{{O}_{6}}+2NaI\] In this reaction, Eq. wt. of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}=\frac{~Molecular\text{ }weight}{3\times 2}\] \[=\frac{Molecular\text{ }weight}{6}\]
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