(B) The reaction sequence is as follows:$1$. $P$ is a coloured solution containing $Fe^{2+}$ ions (pale green).$2$. Upon exposure to air,$Fe^{2+}$ is

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(B) The reaction sequence is as follows:$1$. $P$ is a coloured solution containing $Fe^{2+}$ ions (pale green).$2$. Upon exposure to air,$Fe^{2+}$ is oxidized to $Fe^{3+}$,forming solution $Q$ (yellowish).$3$. When $KOH$ is added to $Q$,$Fe^{3+}$ forms a reddish-brown precipitate of $Fe(OH)_3$ $(R)$.$4$. $Fe(OH)_3$ is insoluble in both excess $NaOH$ and excess $NH_3$ solution.Therefore,$P$ contains $Fe^{2+}(aq.)$.

Class 12 Chemistry d-and f-Block Elements Chemical properties

Medium

$\underset{\text{coloured}}{P(\text{soln.})}$ $\xrightarrow{\text{Air}} \underset{\text{coloured}}{Q(\text{soln.})}$ $\xrightarrow{KOH} R \downarrow$
$(R = \text{ppt. Insoluble in both excess } NaOH \text{ and excess } NH_3 \text{ solution})$
Then $P$ contains

A
$Cu^{2+}(aq.)$
B
$Fe^{2+}(aq.)$
C
$Cr^{2+}(aq.)$
D
$Ni^{2+}(aq.)$

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d-and f-Block Elements

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Chemical properties

Which of the following represents the correct chemical reactions related to iron and its compounds?

Medium

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Explain the catalytic properties of transition metals.

Difficult

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Which of the following is the correct order of acidic character?

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Which of the following metals becomes passive when treated with concentrated $HNO_3$?

Easy

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Fill in the blanks:
$(a)$ The only $Mn$ halide compound that shows an oxidation state of $+7$ is ........
$(b)$ The $E^{\ominus}_{M^{II}/M}$ value is maximum negative for ........ in the $3d$ series.
$(c)$ Between $Cr^{2+}$ and $Fe^{2+}$,the stronger reducing agent is ........

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$\underset{\text{coloured}}{P(\text{soln.})}$ $\xrightarrow{\text{Air}} \underset{\text{coloured}}{Q(\text{soln.})}$ $\xrightarrow{KOH} R \downarrow$$(R = \text{ppt. Insoluble in both excess } NaOH \text{ and excess } NH_3 \text{ solution})$Then $P$ contains

Similar Questions

Which of the following represents the correct chemical reactions related to iron and its compounds?

Explain the catalytic properties of transition metals.

Which of the following is the correct order of acidic character?

Which of the following metals becomes passive when treated with concentrated $HNO_3$?

Fill in the blanks:$(a)$ The only $Mn$ halide compound that shows an oxidation state of $+7$ is ........ $(b)$ The $E^{\ominus}_{M^{II}/M}$ value is maximum negative for ........ in the $3d$ series.$(c)$ Between $Cr^{2+}$ and $Fe^{2+}$,the stronger reducing agent is ........

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$\underset{\text{coloured}}{P(\text{soln.})}$ $\xrightarrow{\text{Air}} \underset{\text{coloured}}{Q(\text{soln.})}$ $\xrightarrow{KOH} R \downarrow$
$(R = \text{ppt. Insoluble in both excess } NaOH \text{ and excess } NH_3 \text{ solution})$
Then $P$ contains

Fill in the blanks:
$(a)$ The only $Mn$ halide compound that shows an oxidation state of $+7$ is ........
$(b)$ The $E^{\ominus}_{M^{II}/M}$ value is maximum negative for ........ in the $3d$ series.
$(c)$ Between $Cr^{2+}$ and $Fe^{2+}$,the stronger reducing agent is ........