MCQ
For a very dilute solution of H3​PO3​ van't Hoff factor is:
  • A
    i = 7
  • B
    i = 3
  • C
    i = 4
  • D
    i = 5

Answer

  1. i = 3

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$p$-Amino- $N, N$-dimethylaniline is added to a strongly acidic solution of ${X}$. The resulting solution is treated with a few drops of aqueous solution of ${Y}$ to yield blue coloration due to the formation of methylene blue. Treatment of the aqueous solution of ${Y}$ with the reagent potassium hexacyanoferrate$(II)$ leads to the formation of an intense blue precipitate. The precipitate dissolves on excess addition of the reagent. Similarly, treatment of the solution of ${Y}$ with the solution of potassium hexacyanoferrate$(III)$ leads to a brown coloration due to the formation of ${Z}$.

$1.$ The compound ${X}$ is

$(A)$ $\mathrm{NaNO}_3$ $(B)$ $\mathrm{NaCl}$ $(C)$ $\mathrm{Na}_2 \mathrm{SO}_4$ $(D)$ $\mathrm{Na}_2 \mathrm{~S}$

$2.$ The compound ${Y}$ is

$(A)$ $\mathrm{MgCl}_2$ $(B)$ $\mathrm{FeCl}_2$ $(C)$ $\mathrm{FeCl}_3$ $(D)$ $\mathrm{ZnCl}_2$

$3.$ The compound ${Z}$ is

$(A)$ $\left.\mathrm{Mg}_2 \mid \mathrm{Fe}(\mathrm{CN})_6\right]$ $(B)$ $\operatorname{Fe}\left[\mathrm{Fe}(\mathrm{CN})_6\right]$

$(C)$ $\mathrm{Fe}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]_3$ $(D)$ $\mathrm{K}_2 \mathrm{Zn}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]_2$

Give the answer question $1,2$ and $3.$

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