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(D) . The fifth group radicals $(Ba^{2+}, Sr^{2+}, Ca^{2+})$ are precipitated as carbonates using $(NH_4)_2CO_3$ in the presence of $NH_4Cl$ and $NH_4

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Magnesium will be precipitated

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(D) . The fifth group radicals $(Ba^{2+}, Sr^{2+}, Ca^{2+})$ are precipitated as carbonates using $(NH_4)_2CO_3$ in the presence of $NH_4Cl$ and $NH_4OH$.When $(NH_4)_2CO_3$ is used,the concentration of $CO_3^{2-}$ ions is kept low due to the common ion effect of $NH_4^+$.However,if $Na_2CO_3$ is used,the concentration of $CO_3^{2-}$ ions becomes very high.This high concentration of $CO_3^{2-}$ causes $Mg^{2+}$ ions (which belong to the $VI^{th}$ group) to precipitate as $MgCO_3$ along with the $V^{th}$ group radicals,thus interfering with the analysis.

Column-$I$	Column-$II$
$(i)$ Blood like red colour	$(a)$ $Fe_4[Fe(CN)_6]_3$
$(ii)$ Sodium nitroprusside	$(b)$ $(NH_4)_2MoO_4$
$(iii)$ Ammonium molybdate	$(c)$ $[Fe(SCN)]^{2+}$
$(iv)$ Ferri-ferro cyanide	$(d)$ $Na_2[Fe(CN)_5NO]$

$LIST$-$I$ (Precipitating reagent and conditions)	$LIST$-$II$ (Cation)
$A$. $NH_4Cl + NH_4OH$	$I$. $Mn^{2+}$
$B$. $NH_4OH + (NH_4)_2CO_3$	$II$. $Pb^{2+}$
$C$. $NH_4OH + NH_4Cl + H_2S$ gas	$III$. $Al^{3+}$
$D$. Dilute $HCl$	$IV$. $Sr^{2+}$

Sodium carbonate cannot be used in place of ammonium carbonate for the precipitation of the fifth group radicals because

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Which of the following reagents is commonly used to detect the presence of sulfide ions?

Match column-$I$ and column-$II$ with correct relation:

Column-$I$ Column-$II$

$(i)$ Blood like red colour $(a)$ $Fe_4[Fe(CN)_6]_3$

$(ii)$ Sodium nitroprusside $(b)$ $(NH_4)_2MoO_4$

$(iii)$ Ammonium molybdate $(c)$ $[Fe(SCN)]^{2+}$

$(iv)$ Ferri-ferro cyanide $(d)$ $Na_2[Fe(CN)_5NO]$

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Which ion is not precipitated by both $HCl$ and $H_2S$?

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