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Aqua Regia

Which of the ...

Question

Which of the following are soluble in excess of $N a O H$ ?
(X) : ${A s}_{2} S_{3}$ ; (Y) : $C u S$ ; (Z) : ${A l C l}_{3}$

X, Y, Z

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Y, Z

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X, Z

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X, Y

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Solution

The correct option is D X, Z
(X) : ${A s}_{2} S_{3}$ and (Z) : ${A l C l}_{3}$ are soluble in excess of $N a O H$ as they form soluble sodium meta aluminate $(N a A l O_{2})$ and sodium meta arsenate $(N a A s O_{2})$ .
(Y) : $C u S$ is not solble in excess $N a O H$ .

Suggest Corrections

Similar questions

N a O H

(X) : P b {(O H)}_{2}

(Y) : C u S

(Z) : A l {(O H)}_{3}

\frac{x (y + z - x)}{log x} = \frac{y (z + x - y)}{log y} = \frac{z (x + y - z)}{log z}

x^{y} y^{x} + z^{y} y^{z} - 2 x^{z} z^{x}

x (y - z) (y + z) + y (z - x) + z (x - y) (x + y)

\begin{matrix} (x + y)^{2} & z x & z y z x & (z + y)^{2} & x y z y & x y & (z + x)^{2} \end{matrix}

2 x y z (x + y + z)^{3}

x^{2} + y^{2} + z^{2}

x^{2} + x y + x z = 135, y^{2} + y z + y x = 351

z^{2} + z x + z y = 243

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