(B) The addition of $NH_4Cl$ followed by $NH_4OH$ creates a buffer solution that suppresses the concentration of $OH^-$ ions due to the common ion eff

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(B) The addition of $NH_4Cl$ followed by $NH_4OH$ creates a buffer solution that suppresses the concentration of $OH^-$ ions due to the common ion effect of $NH_4^+$.In this condition,the concentration of $OH^-$ is sufficient to exceed the solubility product $(K_{sp})$ of $III^{rd}$ group cations ($Al^{3+}$,$Fe^{3+}$,$Cr^{3+}$) but insufficient to precipitate $IV^{th}$ group cations ($Zn^{2+}$,$Ni^{2+}$,$Mn^{2+}$,$Co^{2+}$).Therefore,only $Al(OH)_3$ and $Fe(OH)_3$ will precipitate as hydroxides.The correct option is $B$.

Class 12 Chemistry Principles Related to Practical Chemistry Wet Test for Basic Radical

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$Al^{3+}$,$Fe^{3+}$,$Zn^{2+}$,and $Ni^{2+}$ ions are present in an acidic solution. Excess of ammonium chloride $(NH_4Cl)$ solution is added followed by the addition of ammonium hydroxide $(NH_4OH)$ solution. The resulting precipitate will contain:

A
$Zn(OH)_2$ and $Ni(OH)_2$
B
$Al(OH)_3$ and $Fe(OH)_3$
C
$Zn(OH)_2$ and $Al(OH)_3$
D
$Ni(OH)_2$ and $Fe(OH)_3$

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Wet Test for Basic Radical

On treating a solid salt $A$ with dil. $H_2SO_4$ and warming,reddish-brown fumes of gas $B$ are evolved. Addition of $C$ to the salt solution of $A$ followed by freshly prepared starch solution and acidification with acetic acid produces a blue colour. $C$ may contain:

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The $V^{-}A$ group precipitate was dissolved in $HNO_3$ and treated with an excess of $NH_4OH$. It gives a white precipitate because of:

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$H_2S$ gas is passed through an acidified solution containing $Ag^+$,$Cu^{2+}$,and $Zn^{2+}$ ions. Which of these will form a precipitate?

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Which of the following is not precipitated as sulphide by passing $H_2S$ in the presence of concentrated $HCl$?

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$A$ metal salt gives a yellow precipitate with potassium chromate in acetic acid and a white precipitate with dilute sulfuric acid,but it does not give a precipitate with sodium chloride or sodium iodide. What will be the composition of the white precipitate formed when sodium carbonate is added to the solution of this metal salt?

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$Al^{3+}$,$Fe^{3+}$,$Zn^{2+}$,and $Ni^{2+}$ ions are present in an acidic solution. Excess of ammonium chloride $(NH_4Cl)$ solution is added followed by the addition of ammonium hydroxide $(NH_4OH)$ solution. The resulting precipitate will contain:

Similar Questions

On treating a solid salt $A$ with dil. $H_2SO_4$ and warming,reddish-brown fumes of gas $B$ are evolved. Addition of $C$ to the salt solution of $A$ followed by freshly prepared starch solution and acidification with acetic acid produces a blue colour. $C$ may contain:

The $V^{-}A$ group precipitate was dissolved in $HNO_3$ and treated with an excess of $NH_4OH$. It gives a white precipitate because of:

$H_2S$ gas is passed through an acidified solution containing $Ag^+$,$Cu^{2+}$,and $Zn^{2+}$ ions. Which of these will form a precipitate?

Which of the following is not precipitated as sulphide by passing $H_2S$ in the presence of concentrated $HCl$?

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