In which of the following redox reactions is | vedclass

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(A) $1$. $Cr^{3+}(aq.) + Na_{2}O_{2}(sol.) \longrightarrow CrO_{4}^{2-}(aq.)$ (Soluble chromate ion,no precipitate formed).$2$. $Fe^{3+}(aq.) + (NH_{4

Vedclass · Accepted Answer

$Cr^{3+}(aq.) + Na_{2}O_{2}(sol.) 	o$

Vedclass · Answer

(A) $1$. $Cr^{3+}(aq.) + Na_{2}O_{2}(sol.) \longrightarrow CrO_{4}^{2-}(aq.)$ (Soluble chromate ion,no precipitate formed).$2$. $Fe^{3+}(aq.) + (NH_{4})_{2}S \longrightarrow Fe_{2}S_{3} \downarrow$ (Ferric sulfide precipitate formed).$3$. $Mn^{2+}(aq.) + H_{2}O_{2} + NH_{3}(sol.) \longrightarrow MnO(OH)_{2} \downarrow$ (Manganese hydroxide precipitate formed).$4$. $Fe^{2+}(aq.) + Na_{2}O_{2}(sol.) \longrightarrow Fe(OH)_{3} \downarrow$ (Ferric hydroxide precipitate formed).Thus,the reaction in option $A$ does not form a precipitate.

Column $I$	Column $II$
$(A)$ $Cu + \text{dil } HNO_3$	$(p)$ $NO$
$(B)$ $Cu + \text{conc } HNO_3$	$(q)$ $NO_2$
$(C)$ $Zn + \text{dil } HNO_3$	$(r)$ $N_2O$
$(D)$ $Zn + \text{conc } HNO_3$	$(s)$ $Cu(NO_3)_2$
	$(t)$ $Zn(NO_3)_2$

In which of the following redox reactions is a precipitate $NOT$ formed?

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