(B) Copper sulphide $(CuS)$ is black in colour.$Cu^{2+}$ is placed in group $II$ of inorganic qualitative analysis.It is precipitated in the form of s

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(B) Copper sulphide $(CuS)$ is black in colour.$Cu^{2+}$ is placed in group $II$ of inorganic qualitative analysis.It is precipitated in the form of sulphide by passing $H_2S$ gas in the presence of dilute $HCl$.The reaction is: $Cu^{2+} + H_2S \to \underset{\text{black}}{CuS} + 2H^{+}$

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

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The colour of copper sulphide is

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Blue
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Red
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Green

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When $H_2S$ gas is passed through a solution,it reacts to form a white precipitate. Which ion is present in the solution?

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Statement-$1$: Few drops of $HNO_3$ are added before proceeding to $III^{rd}$ group.
Statement-$2$: For the oxidation of $Fe^{+2} \rightarrow Fe^{+3}$.

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$A$ solution prepared in conc. $HCl$ sometimes gives white turbidity even in the absence of $1^{st}$ group,when water is added to it. It is due to the presence of

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$X_2S_n + H_2O \to X(OH)_n \downarrow + Y \uparrow (Gas) \xrightarrow{Pb(CH_3COO)_2} Z \downarrow (Black \ ppt.)$
Then $(X)$ cation can not be

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In a solution containing $Hg^{2+}, Cd^{2+}, Sr^{2+}, Fe^{2+},$ and $Cu^{2+}$ ions in $0.3 \, M \, HCl$,which ions will precipitate upon the addition of $H_2S$?

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The colour of copper sulphide is

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When $H_2S$ gas is passed through a solution,it reacts to form a white precipitate. Which ion is present in the solution?

Statement-$1$: Few drops of $HNO_3$ are added before proceeding to $III^{rd}$ group. Statement-$2$: For the oxidation of $Fe^{+2} \rightarrow Fe^{+3}$.

$A$ solution prepared in conc. $HCl$ sometimes gives white turbidity even in the absence of $1^{st}$ group,when water is added to it. It is due to the presence of

$X_2S_n + H_2O \to X(OH)_n \downarrow + Y \uparrow (Gas) \xrightarrow{Pb(CH_3COO)_2} Z \downarrow (Black \ ppt.)$Then $(X)$ cation can not be

In a solution containing $Hg^{2+}, Cd^{2+}, Sr^{2+}, Fe^{2+},$ and $Cu^{2+}$ ions in $0.3 \, M \, HCl$,which ions will precipitate upon the addition of $H_2S$?

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Statement-$1$: Few drops of $HNO_3$ are added before proceeding to $III^{rd}$ group.
Statement-$2$: For the oxidation of $Fe^{+2} \rightarrow Fe^{+3}$.

$X_2S_n + H_2O \to X(OH)_n \downarrow + Y \uparrow (Gas) \xrightarrow{Pb(CH_3COO)_2} Z \downarrow (Black \ ppt.)$
Then $(X)$ cation can not be