QBManager

PRACTICAL CHEMISTRY

37338 The ion that cannot be precipitated by both $H C l$ and $H_{2} S$ is

1

P b^{2 +}

2

C u^{+}

3

A g^{+}

4

S n^{2 +}

PRACTICAL CHEMISTRY

37339 $P b {(C H_{3} C O O)}_{2}$ gives….colour with $H_{2} S$

1 Orange

2 Red

3 Black

4 White

Explanation:

(c) $(C H_{3} C O O)_{2} P b + H_{2} S \to 2 C H_{3} C O O H \underset{b l a c k p p t .}{+ P b S ↓}$

PRACTICAL CHEMISTRY

37340 $F e_{2}^{+}$ ion can be distinguished by $F e_{3}^{+}$ ion by

1

N H_{4} S C N

2

A g N O_{3}

3

B a C l_{2}

4 None of these

Explanation:

(a) $(N H_{4}) S C N$ is a red colour substance.

PRACTICAL CHEMISTRY

37341 Which of the following change the colour of the aqueous solution of $F e C l_{3}$

1

K_{4} [F e {(C N)}_{6}]

2

H_{2} S

3

N H_{4} C N S

4 All of the above

Explanation:

(d) $F e C l_{3} + K_{4} [F e {(C N)}_{6}] \to \underset{F e r r i f e r r o c y a n i d e (B l u e)}{F e_{4} {[F e {(C N)}_{6}]}_{3}}$
$2 F e C l_{3} + 3 H_{2} S \to F e_{2} S_{3} + 6 H C l$
$3 N H_{4} C N S + F e C l_{3} \underset{(B l o o d r e d)}{\to F e {(C N S)}_{3} +}$ $3 N H_{4} C l$
$F e C l_{3} + 3 K C N S \to \underset{(B l o o d r e d)}{F e {(C N S)}_{3}}$ + $3 K C l$

PRACTICAL CHEMISTRY

37338 The ion that cannot be precipitated by both $H C l$ and $H_{2} S$ is

1

P b^{2 +}

2

C u^{+}

3

A g^{+}

4

S n^{2 +}

PRACTICAL CHEMISTRY

37339 $P b {(C H_{3} C O O)}_{2}$ gives….colour with $H_{2} S$

1 Orange

2 Red

3 Black

4 White

Explanation:

(c) $(C H_{3} C O O)_{2} P b + H_{2} S \to 2 C H_{3} C O O H \underset{b l a c k p p t .}{+ P b S ↓}$

PRACTICAL CHEMISTRY

37340 $F e_{2}^{+}$ ion can be distinguished by $F e_{3}^{+}$ ion by

1

N H_{4} S C N

2

A g N O_{3}

3

B a C l_{2}

4 None of these

Explanation:

(a) $(N H_{4}) S C N$ is a red colour substance.

PRACTICAL CHEMISTRY

37341 Which of the following change the colour of the aqueous solution of $F e C l_{3}$

1

K_{4} [F e {(C N)}_{6}]

2

H_{2} S

3

N H_{4} C N S

4 All of the above

Explanation:

(d) $F e C l_{3} + K_{4} [F e {(C N)}_{6}] \to \underset{F e r r i f e r r o c y a n i d e (B l u e)}{F e_{4} {[F e {(C N)}_{6}]}_{3}}$
$2 F e C l_{3} + 3 H_{2} S \to F e_{2} S_{3} + 6 H C l$
$3 N H_{4} C N S + F e C l_{3} \underset{(B l o o d r e d)}{\to F e {(C N S)}_{3} +}$ $3 N H_{4} C l$
$F e C l_{3} + 3 K C N S \to \underset{(B l o o d r e d)}{F e {(C N S)}_{3}}$ + $3 K C l$

PRACTICAL CHEMISTRY

37338 The ion that cannot be precipitated by both $H C l$ and $H_{2} S$ is

1

P b^{2 +}

2

C u^{+}

3

A g^{+}

4

S n^{2 +}

PRACTICAL CHEMISTRY

37339 $P b {(C H_{3} C O O)}_{2}$ gives….colour with $H_{2} S$

1 Orange

2 Red

3 Black

4 White

Explanation:

(c) $(C H_{3} C O O)_{2} P b + H_{2} S \to 2 C H_{3} C O O H \underset{b l a c k p p t .}{+ P b S ↓}$

PRACTICAL CHEMISTRY

37340 $F e_{2}^{+}$ ion can be distinguished by $F e_{3}^{+}$ ion by

1

N H_{4} S C N

2

A g N O_{3}

3

B a C l_{2}

4 None of these

Explanation:

(a) $(N H_{4}) S C N$ is a red colour substance.

PRACTICAL CHEMISTRY

37341 Which of the following change the colour of the aqueous solution of $F e C l_{3}$

1

K_{4} [F e {(C N)}_{6}]

2

H_{2} S

3

N H_{4} C N S

4 All of the above

Explanation:

(d) $F e C l_{3} + K_{4} [F e {(C N)}_{6}] \to \underset{F e r r i f e r r o c y a n i d e (B l u e)}{F e_{4} {[F e {(C N)}_{6}]}_{3}}$
$2 F e C l_{3} + 3 H_{2} S \to F e_{2} S_{3} + 6 H C l$
$3 N H_{4} C N S + F e C l_{3} \underset{(B l o o d r e d)}{\to F e {(C N S)}_{3} +}$ $3 N H_{4} C l$
$F e C l_{3} + 3 K C N S \to \underset{(B l o o d r e d)}{F e {(C N S)}_{3}}$ + $3 K C l$

PRACTICAL CHEMISTRY

37338 The ion that cannot be precipitated by both $H C l$ and $H_{2} S$ is

1

P b^{2 +}

2

C u^{+}

3

A g^{+}

4

S n^{2 +}

PRACTICAL CHEMISTRY

37339 $P b {(C H_{3} C O O)}_{2}$ gives….colour with $H_{2} S$

1 Orange

2 Red

3 Black

4 White

Explanation:

(c) $(C H_{3} C O O)_{2} P b + H_{2} S \to 2 C H_{3} C O O H \underset{b l a c k p p t .}{+ P b S ↓}$

PRACTICAL CHEMISTRY

37340 $F e_{2}^{+}$ ion can be distinguished by $F e_{3}^{+}$ ion by

1

N H_{4} S C N

2

A g N O_{3}

3

B a C l_{2}

4 None of these

Explanation:

(a) $(N H_{4}) S C N$ is a red colour substance.

PRACTICAL CHEMISTRY

37341 Which of the following change the colour of the aqueous solution of $F e C l_{3}$

1

K_{4} [F e {(C N)}_{6}]

2

H_{2} S

3

N H_{4} C N S

4 All of the above

Explanation:

(d) $F e C l_{3} + K_{4} [F e {(C N)}_{6}] \to \underset{F e r r i f e r r o c y a n i d e (B l u e)}{F e_{4} {[F e {(C N)}_{6}]}_{3}}$
$2 F e C l_{3} + 3 H_{2} S \to F e_{2} S_{3} + 6 H C l$
$3 N H_{4} C N S + F e C l_{3} \underset{(B l o o d r e d)}{\to F e {(C N S)}_{3} +}$ $3 N H_{4} C l$
$F e C l_{3} + 3 K C N S \to \underset{(B l o o d r e d)}{F e {(C N S)}_{3}}$ + $3 K C l$