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Standard XII

Chemistry

Froth Floatation

A mixture of ...

Question

A mixture of the sulphides of $A s_{2} S_{3}, S b_{2} S_{3}$ and $B i_{2} S_{3}$ was treated with a $N a_{2} S$ solution. $A s_{2} S_{3}$ remained undissolved.

True

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False

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Solution

The correct option is B False
$B i_{2} S_{3}$ remains undissolved while
$A s_{2} S_{3} + 3 N a_{2} S ⟶ 2 N a_{3} [A s S_{3}] s o l u b l e$
$S b_{2} S_{3} + 3 N a_{2} S ⟶ 2 N a_{3} [S b S_{3}] s o l u b l e$

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Similar questions

Q. A mixture of the sulphides of

A s_{2} S_{3}, S b_{2} S_{3}

and

B i_{2} S_{3}

was treated with a

N a_{2} S

solution. Which sulphide remained undissolved? Write the equation of the sulphide dissolving reactions.

Q. In a coagulation experiment ,

5 m l

A s_{2} S_{3}

is mixed with

0.1 M

solution of an electrolyte ‘

A B

’ so that the total volume is

10 m L

. It was found that all solution coagulates leaving ‘

A B

’ equivalent to

0.4 m L

0.1 M

solution. What is the flocculation value of

A B

for

A s_{2} S_{3}

sol?

Q. In a coagulation experiment ,

5 m l

A s_{2} S_{3}

is mixed with

0.1 M

solution of an electrolyte ‘

A B

’ so that the total volume is

10 m L

. It was found that all solution coagulates leaving ‘

A B

’ equivalent to

0.4 m L

0.1 M

solution. What is the flocculation value of

A B

for

A s_{2} S_{3}

sol?

Q. A sample of

A g C l

was treated with

5 m L

1.5 M

{N a}_{2} {C O}_{3}

solution to give

{A g}_{2} {C O}_{3}

. The remaining solution contained

0.0026 g {C l}^{-}

per litre. Calculate the solubility product of

A g C l

(K_{s p} ({A g}_{2} {C O}_{3}) = 8.2 \times 10^{- 12})

Q. A sample of

A g C l

was treated with

5

mL of

1.5 M

{N a}_{2} {C O}_{3}

solution to give

{A g}_{2} {C O}_{3}

. The remaining solution contained

0.0026 g

{C l}^{-}

per litre. The solubility product of

A g C l

(

K_{s p}

_{({A g}_{2} {C O}_{3})} = 8.2 \times 10^{- 12}

)

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A mixture of the sulphides of As2S3,Sb2S3 and Bi2S3 was treated with a Na2S solution. As2S3 remained undissolved.

The correct option is B FalseBi2S3 remains undissolved whileAs2S3+3Na2S⟶2Na3[AsS3]solubleSb2S3+3Na2S⟶2Na3[SbS3]soluble

A mixture of the sulphides of $A s_{2} S_{3}, S b_{2} S_{3}$ and $B i_{2} S_{3}$ was treated with a $N a_{2} S$ solution. $A s_{2} S_{3}$ remained undissolved.

The correct option is B False
$B i_{2} S_{3}$ remains undissolved while
$A s_{2} S_{3} + 3 N a_{2} S ⟶ 2 N a_{3} [A s S_{3}] s o l u b l e$
$S b_{2} S_{3} + 3 N a_{2} S ⟶ 2 N a_{3} [S b S_{3}] s o l u b l e$