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PRACTICAL CHEMISTRY

37406 Which mixture is separated by conc. aqueous solution of sodium hydroxide

1

A l^{3 +}

and

S n^{2 +}

2

A l^{3 +}

and

F e^{3 +}

3

A l^{3 +}

and

Z n^{2 +}

4

Z n^{2 +}

and

P b^{2 +}

Explanation:

$N a O H + A l^{+ 3} \to N a A l O_{2}$
$N a O H + F e^{+ 3} \to$ No reaction (Insoluble in $N a O H$ )

PRACTICAL CHEMISTRY

37346 An aqueous solution of an inorganic salt on treatment with $H C l$ gives a white precipitate. This solution contains

1

{H g_{2}}^{2 +}

2

H g^{2 +}

3

Z n^{2 +}

4

C d^{2 +}

Explanation:

$H g_{2}^{2 +}$ will produce white ppt with dil $H C l$ .
$H g_{2}^{+ 2} + 2 H C l ⟶ \underset{White ppt}{H g_{2} C l_{2} ↓} + 2 H^{+}$
This precipitation is possible due to very low value of the solubility products.

PRACTICAL CHEMISTRY

37347 Lead sulphate is soluble

1 In conc. nitric acid

2 In conc. hydrochloric acid

3 In a solution of ammonium acetate

4 In water

Explanation:

Lead sulphate is solube in a solution of ammonium acetate.
because the $r x^{n}$ ,
$P b_{4} {(S O_{4})}_{2} + \overset{A m m o n i u m a c e t a t e}{\to}$ lead acetate $+$ Ammonium sulphate

PRACTICAL CHEMISTRY

37348 Which one of the following sulphides is yellow

1 Zinc sulphide

2 Cadmium sulphide

3 Nickel sulphide

4 Lead sulphide

Explanation:

The color of the sulphides are as follows $C d S :$ yellow color
$Z n S :$ White color when puse and black if impuse
$P b S$ and $N i S :$ Black color.

PRACTICAL CHEMISTRY

37349 When $H_{2} S$ gas is passed through the $H C l$ containing aqueous solutions of $C u C l_{2}$ , $H g C l_{2}$ , $B i C l_{3}$ and $C o C l_{2}$ , which does not precipitate out

1

C u S

2

H g S

3

B i_{2} S_{3}

4

C o S

PRACTICAL CHEMISTRY

37406 Which mixture is separated by conc. aqueous solution of sodium hydroxide

1

A l^{3 +}

and

S n^{2 +}

2

A l^{3 +}

and

F e^{3 +}

3

A l^{3 +}

and

Z n^{2 +}

4

Z n^{2 +}

and

P b^{2 +}

Explanation:

$N a O H + A l^{+ 3} \to N a A l O_{2}$
$N a O H + F e^{+ 3} \to$ No reaction (Insoluble in $N a O H$ )

PRACTICAL CHEMISTRY

37346 An aqueous solution of an inorganic salt on treatment with $H C l$ gives a white precipitate. This solution contains

1

{H g_{2}}^{2 +}

2

H g^{2 +}

3

Z n^{2 +}

4

C d^{2 +}

Explanation:

$H g_{2}^{2 +}$ will produce white ppt with dil $H C l$ .
$H g_{2}^{+ 2} + 2 H C l ⟶ \underset{White ppt}{H g_{2} C l_{2} ↓} + 2 H^{+}$
This precipitation is possible due to very low value of the solubility products.

PRACTICAL CHEMISTRY

37347 Lead sulphate is soluble

1 In conc. nitric acid

2 In conc. hydrochloric acid

3 In a solution of ammonium acetate

4 In water

Explanation:

Lead sulphate is solube in a solution of ammonium acetate.
because the $r x^{n}$ ,
$P b_{4} {(S O_{4})}_{2} + \overset{A m m o n i u m a c e t a t e}{\to}$ lead acetate $+$ Ammonium sulphate

PRACTICAL CHEMISTRY

37348 Which one of the following sulphides is yellow

1 Zinc sulphide

2 Cadmium sulphide

3 Nickel sulphide

4 Lead sulphide

Explanation:

The color of the sulphides are as follows $C d S :$ yellow color
$Z n S :$ White color when puse and black if impuse
$P b S$ and $N i S :$ Black color.

PRACTICAL CHEMISTRY

37349 When $H_{2} S$ gas is passed through the $H C l$ containing aqueous solutions of $C u C l_{2}$ , $H g C l_{2}$ , $B i C l_{3}$ and $C o C l_{2}$ , which does not precipitate out

1

C u S

2

H g S

3

B i_{2} S_{3}

4

C o S

PRACTICAL CHEMISTRY

37406 Which mixture is separated by conc. aqueous solution of sodium hydroxide

1

A l^{3 +}

and

S n^{2 +}

2

A l^{3 +}

and

F e^{3 +}

3

A l^{3 +}

and

Z n^{2 +}

4

Z n^{2 +}

and

P b^{2 +}

Explanation:

$N a O H + A l^{+ 3} \to N a A l O_{2}$
$N a O H + F e^{+ 3} \to$ No reaction (Insoluble in $N a O H$ )

PRACTICAL CHEMISTRY

37346 An aqueous solution of an inorganic salt on treatment with $H C l$ gives a white precipitate. This solution contains

1

{H g_{2}}^{2 +}

2

H g^{2 +}

3

Z n^{2 +}

4

C d^{2 +}

Explanation:

$H g_{2}^{2 +}$ will produce white ppt with dil $H C l$ .
$H g_{2}^{+ 2} + 2 H C l ⟶ \underset{White ppt}{H g_{2} C l_{2} ↓} + 2 H^{+}$
This precipitation is possible due to very low value of the solubility products.

PRACTICAL CHEMISTRY

37347 Lead sulphate is soluble

1 In conc. nitric acid

2 In conc. hydrochloric acid

3 In a solution of ammonium acetate

4 In water

Explanation:

Lead sulphate is solube in a solution of ammonium acetate.
because the $r x^{n}$ ,
$P b_{4} {(S O_{4})}_{2} + \overset{A m m o n i u m a c e t a t e}{\to}$ lead acetate $+$ Ammonium sulphate

PRACTICAL CHEMISTRY

37348 Which one of the following sulphides is yellow

1 Zinc sulphide

2 Cadmium sulphide

3 Nickel sulphide

4 Lead sulphide

Explanation:

The color of the sulphides are as follows $C d S :$ yellow color
$Z n S :$ White color when puse and black if impuse
$P b S$ and $N i S :$ Black color.

PRACTICAL CHEMISTRY

37349 When $H_{2} S$ gas is passed through the $H C l$ containing aqueous solutions of $C u C l_{2}$ , $H g C l_{2}$ , $B i C l_{3}$ and $C o C l_{2}$ , which does not precipitate out

1

C u S

2

H g S

3

B i_{2} S_{3}

4

C o S

PRACTICAL CHEMISTRY

37406 Which mixture is separated by conc. aqueous solution of sodium hydroxide

1

A l^{3 +}

and

S n^{2 +}

2

A l^{3 +}

and

F e^{3 +}

3

A l^{3 +}

and

Z n^{2 +}

4

Z n^{2 +}

and

P b^{2 +}

Explanation:

$N a O H + A l^{+ 3} \to N a A l O_{2}$
$N a O H + F e^{+ 3} \to$ No reaction (Insoluble in $N a O H$ )

PRACTICAL CHEMISTRY

37346 An aqueous solution of an inorganic salt on treatment with $H C l$ gives a white precipitate. This solution contains

1

{H g_{2}}^{2 +}

2

H g^{2 +}

3

Z n^{2 +}

4

C d^{2 +}

Explanation:

$H g_{2}^{2 +}$ will produce white ppt with dil $H C l$ .
$H g_{2}^{+ 2} + 2 H C l ⟶ \underset{White ppt}{H g_{2} C l_{2} ↓} + 2 H^{+}$
This precipitation is possible due to very low value of the solubility products.

PRACTICAL CHEMISTRY

37347 Lead sulphate is soluble

1 In conc. nitric acid

2 In conc. hydrochloric acid

3 In a solution of ammonium acetate

4 In water

Explanation:

Lead sulphate is solube in a solution of ammonium acetate.
because the $r x^{n}$ ,
$P b_{4} {(S O_{4})}_{2} + \overset{A m m o n i u m a c e t a t e}{\to}$ lead acetate $+$ Ammonium sulphate

PRACTICAL CHEMISTRY

37348 Which one of the following sulphides is yellow

1 Zinc sulphide

2 Cadmium sulphide

3 Nickel sulphide

4 Lead sulphide

Explanation:

The color of the sulphides are as follows $C d S :$ yellow color
$Z n S :$ White color when puse and black if impuse
$P b S$ and $N i S :$ Black color.

PRACTICAL CHEMISTRY

37349 When $H_{2} S$ gas is passed through the $H C l$ containing aqueous solutions of $C u C l_{2}$ , $H g C l_{2}$ , $B i C l_{3}$ and $C o C l_{2}$ , which does not precipitate out

1

C u S

2

H g S

3

B i_{2} S_{3}

4

C o S

PRACTICAL CHEMISTRY

37406 Which mixture is separated by conc. aqueous solution of sodium hydroxide

1

A l^{3 +}

and

S n^{2 +}

2

A l^{3 +}

and

F e^{3 +}

3

A l^{3 +}

and

Z n^{2 +}

4

Z n^{2 +}

and

P b^{2 +}

Explanation:

$N a O H + A l^{+ 3} \to N a A l O_{2}$
$N a O H + F e^{+ 3} \to$ No reaction (Insoluble in $N a O H$ )

PRACTICAL CHEMISTRY

37346 An aqueous solution of an inorganic salt on treatment with $H C l$ gives a white precipitate. This solution contains

1

{H g_{2}}^{2 +}

2

H g^{2 +}

3

Z n^{2 +}

4

C d^{2 +}

Explanation:

$H g_{2}^{2 +}$ will produce white ppt with dil $H C l$ .
$H g_{2}^{+ 2} + 2 H C l ⟶ \underset{White ppt}{H g_{2} C l_{2} ↓} + 2 H^{+}$
This precipitation is possible due to very low value of the solubility products.

PRACTICAL CHEMISTRY

37347 Lead sulphate is soluble

1 In conc. nitric acid

2 In conc. hydrochloric acid

3 In a solution of ammonium acetate

4 In water

Explanation:

Lead sulphate is solube in a solution of ammonium acetate.
because the $r x^{n}$ ,
$P b_{4} {(S O_{4})}_{2} + \overset{A m m o n i u m a c e t a t e}{\to}$ lead acetate $+$ Ammonium sulphate

PRACTICAL CHEMISTRY

37348 Which one of the following sulphides is yellow

1 Zinc sulphide

2 Cadmium sulphide

3 Nickel sulphide

4 Lead sulphide

Explanation:

The color of the sulphides are as follows $C d S :$ yellow color
$Z n S :$ White color when puse and black if impuse
$P b S$ and $N i S :$ Black color.

PRACTICAL CHEMISTRY

37349 When $H_{2} S$ gas is passed through the $H C l$ containing aqueous solutions of $C u C l_{2}$ , $H g C l_{2}$ , $B i C l_{3}$ and $C o C l_{2}$ , which does not precipitate out

1

C u S

2

H g S

3

B i_{2} S_{3}

4

C o S

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