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PRACTICAL CHEMISTRY

37342 Which of the following substances are soluble in concentrated $H N O_{3}$

1

H g S

2

C u S

3

P b S

4 All of the above

Explanation:

$C u S, P b S, H g S$ substances are soluble in concentrated $H N O_{3}$ .

PRACTICAL CHEMISTRY

37343 Which of the following cannot give iodometric titrations

1

F e^{3 +}

2

C u^{2 +}

3

P b^{2 +}

4

A g^{2 +}

Explanation:

Atom in highest oxidation state can oxidize iodide to liberate $I_{2}$ which is volumetrically measured by iodometric titration using hypo.
$2 I^{-} \to I_{2}$
$P b^{+ 2} \to$ Lowest oxidation state can not oxidise iodide to $I_{2}$ .

PRACTICAL CHEMISTRY

37344 Which of the following mixture is chromic acid

1

K_{2} C r_{2} O_{7}

and

H C l

2

K_{2} S O_{4}

and conc.

H_{2} S O_{4}

3

K_{2} C r_{2} O_{7}

and conc.

H_{2} S O_{4}

4

H_{2} S O_{4}

and

H C l

Explanation:

(c) $(C o n c . H_{2} S O_{4} + K_{2} C r_{2} O_{7})$ mixture is called as chromic acid.

PRACTICAL CHEMISTRY

37345 If $N a^{+}$ ion and $S^{2 -}$ ion is larger than $C l^{-}$ ion, which of the following will be least soluble in water

1

M g S

2

N a C l

3

N a_{2} S

4

M g C l_{2}

Explanation:

(a) $N a C l > M g C l_{2} > N a_{2} S > M g S$
Solubility decreasing order

PRACTICAL CHEMISTRY

37342 Which of the following substances are soluble in concentrated $H N O_{3}$

1

H g S

2

C u S

3

P b S

4 All of the above

Explanation:

$C u S, P b S, H g S$ substances are soluble in concentrated $H N O_{3}$ .

PRACTICAL CHEMISTRY

37343 Which of the following cannot give iodometric titrations

1

F e^{3 +}

2

C u^{2 +}

3

P b^{2 +}

4

A g^{2 +}

Explanation:

Atom in highest oxidation state can oxidize iodide to liberate $I_{2}$ which is volumetrically measured by iodometric titration using hypo.
$2 I^{-} \to I_{2}$
$P b^{+ 2} \to$ Lowest oxidation state can not oxidise iodide to $I_{2}$ .

PRACTICAL CHEMISTRY

37344 Which of the following mixture is chromic acid

1

K_{2} C r_{2} O_{7}

and

H C l

2

K_{2} S O_{4}

and conc.

H_{2} S O_{4}

3

K_{2} C r_{2} O_{7}

and conc.

H_{2} S O_{4}

4

H_{2} S O_{4}

and

H C l

Explanation:

(c) $(C o n c . H_{2} S O_{4} + K_{2} C r_{2} O_{7})$ mixture is called as chromic acid.

PRACTICAL CHEMISTRY

37345 If $N a^{+}$ ion and $S^{2 -}$ ion is larger than $C l^{-}$ ion, which of the following will be least soluble in water

1

M g S

2

N a C l

3

N a_{2} S

4

M g C l_{2}

Explanation:

(a) $N a C l > M g C l_{2} > N a_{2} S > M g S$
Solubility decreasing order

PRACTICAL CHEMISTRY

37342 Which of the following substances are soluble in concentrated $H N O_{3}$

1

H g S

2

C u S

3

P b S

4 All of the above

Explanation:

$C u S, P b S, H g S$ substances are soluble in concentrated $H N O_{3}$ .

PRACTICAL CHEMISTRY

37343 Which of the following cannot give iodometric titrations

1

F e^{3 +}

2

C u^{2 +}

3

P b^{2 +}

4

A g^{2 +}

Explanation:

Atom in highest oxidation state can oxidize iodide to liberate $I_{2}$ which is volumetrically measured by iodometric titration using hypo.
$2 I^{-} \to I_{2}$
$P b^{+ 2} \to$ Lowest oxidation state can not oxidise iodide to $I_{2}$ .

PRACTICAL CHEMISTRY

37344 Which of the following mixture is chromic acid

1

K_{2} C r_{2} O_{7}

and

H C l

2

K_{2} S O_{4}

and conc.

H_{2} S O_{4}

3

K_{2} C r_{2} O_{7}

and conc.

H_{2} S O_{4}

4

H_{2} S O_{4}

and

H C l

Explanation:

(c) $(C o n c . H_{2} S O_{4} + K_{2} C r_{2} O_{7})$ mixture is called as chromic acid.

PRACTICAL CHEMISTRY

37345 If $N a^{+}$ ion and $S^{2 -}$ ion is larger than $C l^{-}$ ion, which of the following will be least soluble in water

1

M g S

2

N a C l

3

N a_{2} S

4

M g C l_{2}

Explanation:

(a) $N a C l > M g C l_{2} > N a_{2} S > M g S$
Solubility decreasing order

PRACTICAL CHEMISTRY

37342 Which of the following substances are soluble in concentrated $H N O_{3}$

1

H g S

2

C u S

3

P b S

4 All of the above

Explanation:

$C u S, P b S, H g S$ substances are soluble in concentrated $H N O_{3}$ .

PRACTICAL CHEMISTRY

37343 Which of the following cannot give iodometric titrations

1

F e^{3 +}

2

C u^{2 +}

3

P b^{2 +}

4

A g^{2 +}

Explanation:

Atom in highest oxidation state can oxidize iodide to liberate $I_{2}$ which is volumetrically measured by iodometric titration using hypo.
$2 I^{-} \to I_{2}$
$P b^{+ 2} \to$ Lowest oxidation state can not oxidise iodide to $I_{2}$ .

PRACTICAL CHEMISTRY

37344 Which of the following mixture is chromic acid

1

K_{2} C r_{2} O_{7}

and

H C l

2

K_{2} S O_{4}

and conc.

H_{2} S O_{4}

3

K_{2} C r_{2} O_{7}

and conc.

H_{2} S O_{4}

4

H_{2} S O_{4}

and

H C l

Explanation:

(c) $(C o n c . H_{2} S O_{4} + K_{2} C r_{2} O_{7})$ mixture is called as chromic acid.

PRACTICAL CHEMISTRY

37345 If $N a^{+}$ ion and $S^{2 -}$ ion is larger than $C l^{-}$ ion, which of the following will be least soluble in water

1

M g S

2

N a C l

3

N a_{2} S

4

M g C l_{2}

Explanation:

(a) $N a C l > M g C l_{2} > N a_{2} S > M g S$
Solubility decreasing order

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