The pair(s) of ions where BOTH the ions are p | vedclass

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(B) In qualitative analysis,the group-$II$ cations are precipitated as sulfides by passing $H_2S$ gas in the presence of dilute $HCl$.The group-$II$ c

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$(C, D)$

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(B) In qualitative analysis,the group-$II$ cations are precipitated as sulfides by passing $H_2S$ gas in the presence of dilute $HCl$.The group-$II$ cations include $Cu^{2+}, Pb^{2+}, Hg^{2+}, Bi^{3+}, Cd^{2+}, As^{3+}, Sb^{3+},$ and $Sn^{4+}$.In option $(C)$,both $Cu^{2+}$ and $Pb^{2+}$ belong to group-$II$ and will precipitate as sulfides.In option $(D)$,both $Hg^{2+}$ and $Bi^{3+}$ belong to group-$II$ and will precipitate as sulfides.Therefore,both $(C)$ and $(D)$ are correct pairs.

The pair$(s)$ of ions where $BOTH$ the ions are precipitated upon passing $H_2S$ gas in the presence of dilute $HCl$,is(are):
$(A) Ba^{2+}, Zn^{2+}$
$(B) Bi^{3+}, Fe^{3+}$
$(C) Cu^{2+}, Pb^{2+}$
$(D) Hg^{2+}, Bi^{3+}$

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The pair$(s)$ of ions where $BOTH$ the ions are precipitated upon passing $H_2S$ gas in the presence of dilute $HCl$,is(are):$(A) Ba^{2+}, Zn^{2+}$$(B) Bi^{3+}, Fe^{3+}$$(C) Cu^{2+}, Pb^{2+}$$(D) Hg^{2+}, Bi^{3+}$