Some Basic Concepts of Chemistry - Result Question 83
####21. The volume strength of $1.5 N H _2 O _2$ is
(1990, 1M)
(a) 4.8
(b) 8.4
(c) 3.0
(d) 8.0
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Solution:
- $1.0 L$ of mixture $X$ contain 0.01 mole of each $\left[Co\left(NH _3\right) _5 SO _4\right] Br$ and $\left[Co\left(NH _3\right) _5 Br\right] SO _4$. Also, with $AgNO _3$, only $\left[Co\left(NH _3\right) _5 SO _4\right] Br$ reacts to give $AgBr$ precipitate as $\left[Co\left(NH _3\right) _5 SO _4\right] Br+AgNO _3 \rightarrow\left[Co\left(NH _3\right) _5 SO _4\right] NO _3+AgBr$ $1.0 mol \quad$ Excess $\quad 1.0 mol$ With $BaCl _2$, only $\left[Co\left(NH _3\right) _5 Br _3 SO _4\right.$ reacts giving $BaSO _4$ precipitate as
Hence, moles of $Y$ and $Z$ are 0.01 each.
