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A sample containing ${CaBr}_{2}$ and $NaI$ in mass ratio $\frac{2}{9}$ was dissolved in water and treated with sufficient amount of aq. ${AgNO}_{3}$ solution to form a mixed precipitate of AgI and AgBr. The weight of mixed precipitate was found to be 1786 gm.
$[Na = 23, Br = 80, I = 127, Ca = 40]$
Select the correct option.

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Number of moles of AgBr produced is 1

Mass of original sample was 900 gm

Mass of ${CaBr}_{2}$ in the original sample was 400 gm

Moles of ${CaBr}_{2}$ and N aI in the original sample was 1 and 6 respectively

answer is A.

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Detailed Solution

In the given reaction we have;

${CaBr}_{2}, NaI$

$Mass = 2 W, 9 W$

$Moles = \frac{2 W}{200}, \frac{9 W}{150}$ $\begin{array}{l} [\frac{2 W}{200} \times 2 \times 188 + \frac{9 W}{150} \times 235 = 1786] \\ \Rightarrow W = 100 \end{array}$

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