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PRACTICAL CHEMISTRY

37585 The number of white coloured salts among the following is ................. $(A)$ ${SrSO}_{4}$ $(B)$ $Mg ({NH}_{4}) {PO}_{4}$ $(c)$ ${BaCrO}_{4}$ $(D)$ $Mn (OH)_{2}$ $(E)$ ${PbSO}_{4}$ $(F)$ ${PbCrO}_{4}$ $(G)$ $AgBr$ $(H)$ ${PbI}_{2}$ $(I)$ ${CaC}_{2} O_{4}$ $(J)$ $[Fe (OH)_{2} ({CH}_{3} COO)]$

1

2

2

3

3

4

4

5

Explanation:

${SrSO}_{4} - white$
$Mg ({NH}_{4}) {PO}_{4} - white$
${BaCrO}_{4} - yellow$
$Mn (OH)_{2} - white$
${PbSO}_{4} - white$
${PbCrO}_{4} - yellow$
${AgBr}^{- pale yellow}$
${PbI}_{2} - yellow$
${CaC}_{2} O_{4} - white$
$⌊ Fe (OH)_{2} ({CH}_{3} COO) ⌋ -$ Brown Red

PRACTICAL CHEMISTRY

37586 Given below are two statements:Statement $(I)$ : Dimethyl glyoxime forms a sixmembered covalent chelate when treated with ${NiCl}_{2}$ solution in presence of ${NH}_{4} OH$ .Statement $(I I)$ : Prussian blue precipitate contains iron both in $(+ 2)$ and $(+ 3)$ oxidation states. In the light of the above statements, choose the most appropriate answer from the options given below:

1 Statement

I

is false but Statement

I I

is true

2 Both Statement

I

and Statement

I I

are true

3 Both Statement

I

and Statement

I I

are false

4 Statement

I

is true but Statement

I I

is false

Explanation:

${Ni}^{2 +} + {NH}_{4} OH + dmg \to$
Image
$2$ Five member ring
$I I I$ $I I$
${Fe}_{4} {[Fe (CN)_{6}]}_{3}$
Prussian Blue 221430-s

PRACTICAL CHEMISTRY

37424 Phenolphthalein is not a good indicator for titrating

1

N a O H

against oxalic acid

2 Ferrous sulphate against

K M n O_{4}

3

N a O H

against

H C l

4

N a O H

against

H_{2} S O_{4}

Explanation:

(b) Phenolphthalein is an indicator for strong base and weak acid, but $K M n O_{4}$ oxidises it.

PRACTICAL CHEMISTRY

37552 The correct match between items of

List-I	List-II
A. Coloured impurity	(p) Steam distillation
B. Mixture of o-nitrophenol and p-nitrophenol	(q) Fractional distillation
C. Crude naphtha	(r) Charcoal treatment
D. Mixture of glycerol and sugars	(s) Distillation under reduced pressure

1

(A) - (r), (B) - (s), (C) - (p), (D) - (q)

2

(A) - (p), (B) - (s), (C) - (r), (D) - (q)

3

(A) - (r), (B) - (p), (C) - (q), (D) - (s)

4

(A) - (r), (B) - (p), (C) - (s), (D) - (q)

Explanation:

$(a)$ Charcoal treatment removes coloured impurity through adsorption.
$(b)$ Steam distillation separates the mixture of $o -$ nitrophenol and $p -$ nitrophenol. The onitrophenol is steam volatile ( due to intramolecular hydrogen bonding), and the para isomer is not volatile.
$(c)$ Fractional distillation separates crude naphtha. Naphtha is a flammable liquid hydrocarbon mixture.
$(d)$ Distillation under reduced pressure separates mixture of glycerol and sugars. Vacuum distillation lowers the boiling point and prevents decomposition.

PRACTICAL CHEMISTRY

37585 The number of white coloured salts among the following is ................. $(A)$ ${SrSO}_{4}$ $(B)$ $Mg ({NH}_{4}) {PO}_{4}$ $(c)$ ${BaCrO}_{4}$ $(D)$ $Mn (OH)_{2}$ $(E)$ ${PbSO}_{4}$ $(F)$ ${PbCrO}_{4}$ $(G)$ $AgBr$ $(H)$ ${PbI}_{2}$ $(I)$ ${CaC}_{2} O_{4}$ $(J)$ $[Fe (OH)_{2} ({CH}_{3} COO)]$

1

2

2

3

3

4

4

5

Explanation:

${SrSO}_{4} - white$
$Mg ({NH}_{4}) {PO}_{4} - white$
${BaCrO}_{4} - yellow$
$Mn (OH)_{2} - white$
${PbSO}_{4} - white$
${PbCrO}_{4} - yellow$
${AgBr}^{- pale yellow}$
${PbI}_{2} - yellow$
${CaC}_{2} O_{4} - white$
$⌊ Fe (OH)_{2} ({CH}_{3} COO) ⌋ -$ Brown Red

PRACTICAL CHEMISTRY

37586 Given below are two statements:Statement $(I)$ : Dimethyl glyoxime forms a sixmembered covalent chelate when treated with ${NiCl}_{2}$ solution in presence of ${NH}_{4} OH$ .Statement $(I I)$ : Prussian blue precipitate contains iron both in $(+ 2)$ and $(+ 3)$ oxidation states. In the light of the above statements, choose the most appropriate answer from the options given below:

1 Statement

I

is false but Statement

I I

is true

2 Both Statement

I

and Statement

I I

are true

3 Both Statement

I

and Statement

I I

are false

4 Statement

I

is true but Statement

I I

is false

Explanation:

${Ni}^{2 +} + {NH}_{4} OH + dmg \to$
Image
$2$ Five member ring
$I I I$ $I I$
${Fe}_{4} {[Fe (CN)_{6}]}_{3}$
Prussian Blue 221430-s

PRACTICAL CHEMISTRY

37424 Phenolphthalein is not a good indicator for titrating

1

N a O H

against oxalic acid

2 Ferrous sulphate against

K M n O_{4}

3

N a O H

against

H C l

4

N a O H

against

H_{2} S O_{4}

Explanation:

(b) Phenolphthalein is an indicator for strong base and weak acid, but $K M n O_{4}$ oxidises it.

PRACTICAL CHEMISTRY

37552 The correct match between items of

List-I	List-II
A. Coloured impurity	(p) Steam distillation
B. Mixture of o-nitrophenol and p-nitrophenol	(q) Fractional distillation
C. Crude naphtha	(r) Charcoal treatment
D. Mixture of glycerol and sugars	(s) Distillation under reduced pressure

1

(A) - (r), (B) - (s), (C) - (p), (D) - (q)

2

(A) - (p), (B) - (s), (C) - (r), (D) - (q)

3

(A) - (r), (B) - (p), (C) - (q), (D) - (s)

4

(A) - (r), (B) - (p), (C) - (s), (D) - (q)

Explanation:

$(a)$ Charcoal treatment removes coloured impurity through adsorption.
$(b)$ Steam distillation separates the mixture of $o -$ nitrophenol and $p -$ nitrophenol. The onitrophenol is steam volatile ( due to intramolecular hydrogen bonding), and the para isomer is not volatile.
$(c)$ Fractional distillation separates crude naphtha. Naphtha is a flammable liquid hydrocarbon mixture.
$(d)$ Distillation under reduced pressure separates mixture of glycerol and sugars. Vacuum distillation lowers the boiling point and prevents decomposition.

PRACTICAL CHEMISTRY

37585 The number of white coloured salts among the following is ................. $(A)$ ${SrSO}_{4}$ $(B)$ $Mg ({NH}_{4}) {PO}_{4}$ $(c)$ ${BaCrO}_{4}$ $(D)$ $Mn (OH)_{2}$ $(E)$ ${PbSO}_{4}$ $(F)$ ${PbCrO}_{4}$ $(G)$ $AgBr$ $(H)$ ${PbI}_{2}$ $(I)$ ${CaC}_{2} O_{4}$ $(J)$ $[Fe (OH)_{2} ({CH}_{3} COO)]$

1

2

2

3

3

4

4

5

Explanation:

${SrSO}_{4} - white$
$Mg ({NH}_{4}) {PO}_{4} - white$
${BaCrO}_{4} - yellow$
$Mn (OH)_{2} - white$
${PbSO}_{4} - white$
${PbCrO}_{4} - yellow$
${AgBr}^{- pale yellow}$
${PbI}_{2} - yellow$
${CaC}_{2} O_{4} - white$
$⌊ Fe (OH)_{2} ({CH}_{3} COO) ⌋ -$ Brown Red

PRACTICAL CHEMISTRY

37586 Given below are two statements:Statement $(I)$ : Dimethyl glyoxime forms a sixmembered covalent chelate when treated with ${NiCl}_{2}$ solution in presence of ${NH}_{4} OH$ .Statement $(I I)$ : Prussian blue precipitate contains iron both in $(+ 2)$ and $(+ 3)$ oxidation states. In the light of the above statements, choose the most appropriate answer from the options given below:

1 Statement

I

is false but Statement

I I

is true

2 Both Statement

I

and Statement

I I

are true

3 Both Statement

I

and Statement

I I

are false

4 Statement

I

is true but Statement

I I

is false

Explanation:

${Ni}^{2 +} + {NH}_{4} OH + dmg \to$
Image
$2$ Five member ring
$I I I$ $I I$
${Fe}_{4} {[Fe (CN)_{6}]}_{3}$
Prussian Blue 221430-s

PRACTICAL CHEMISTRY

37424 Phenolphthalein is not a good indicator for titrating

1

N a O H

against oxalic acid

2 Ferrous sulphate against

K M n O_{4}

3

N a O H

against

H C l

4

N a O H

against

H_{2} S O_{4}

Explanation:

(b) Phenolphthalein is an indicator for strong base and weak acid, but $K M n O_{4}$ oxidises it.

PRACTICAL CHEMISTRY

37552 The correct match between items of

List-I	List-II
A. Coloured impurity	(p) Steam distillation
B. Mixture of o-nitrophenol and p-nitrophenol	(q) Fractional distillation
C. Crude naphtha	(r) Charcoal treatment
D. Mixture of glycerol and sugars	(s) Distillation under reduced pressure

1

(A) - (r), (B) - (s), (C) - (p), (D) - (q)

2

(A) - (p), (B) - (s), (C) - (r), (D) - (q)

3

(A) - (r), (B) - (p), (C) - (q), (D) - (s)

4

(A) - (r), (B) - (p), (C) - (s), (D) - (q)

Explanation:

$(a)$ Charcoal treatment removes coloured impurity through adsorption.
$(b)$ Steam distillation separates the mixture of $o -$ nitrophenol and $p -$ nitrophenol. The onitrophenol is steam volatile ( due to intramolecular hydrogen bonding), and the para isomer is not volatile.
$(c)$ Fractional distillation separates crude naphtha. Naphtha is a flammable liquid hydrocarbon mixture.
$(d)$ Distillation under reduced pressure separates mixture of glycerol and sugars. Vacuum distillation lowers the boiling point and prevents decomposition.

PRACTICAL CHEMISTRY

37585 The number of white coloured salts among the following is ................. $(A)$ ${SrSO}_{4}$ $(B)$ $Mg ({NH}_{4}) {PO}_{4}$ $(c)$ ${BaCrO}_{4}$ $(D)$ $Mn (OH)_{2}$ $(E)$ ${PbSO}_{4}$ $(F)$ ${PbCrO}_{4}$ $(G)$ $AgBr$ $(H)$ ${PbI}_{2}$ $(I)$ ${CaC}_{2} O_{4}$ $(J)$ $[Fe (OH)_{2} ({CH}_{3} COO)]$

1

2

2

3

3

4

4

5

Explanation:

${SrSO}_{4} - white$
$Mg ({NH}_{4}) {PO}_{4} - white$
${BaCrO}_{4} - yellow$
$Mn (OH)_{2} - white$
${PbSO}_{4} - white$
${PbCrO}_{4} - yellow$
${AgBr}^{- pale yellow}$
${PbI}_{2} - yellow$
${CaC}_{2} O_{4} - white$
$⌊ Fe (OH)_{2} ({CH}_{3} COO) ⌋ -$ Brown Red

PRACTICAL CHEMISTRY

37586 Given below are two statements:Statement $(I)$ : Dimethyl glyoxime forms a sixmembered covalent chelate when treated with ${NiCl}_{2}$ solution in presence of ${NH}_{4} OH$ .Statement $(I I)$ : Prussian blue precipitate contains iron both in $(+ 2)$ and $(+ 3)$ oxidation states. In the light of the above statements, choose the most appropriate answer from the options given below:

1 Statement

I

is false but Statement

I I

is true

2 Both Statement

I

and Statement

I I

are true

3 Both Statement

I

and Statement

I I

are false

4 Statement

I

is true but Statement

I I

is false

Explanation:

${Ni}^{2 +} + {NH}_{4} OH + dmg \to$
Image
$2$ Five member ring
$I I I$ $I I$
${Fe}_{4} {[Fe (CN)_{6}]}_{3}$
Prussian Blue 221430-s

PRACTICAL CHEMISTRY

37424 Phenolphthalein is not a good indicator for titrating

1

N a O H

against oxalic acid

2 Ferrous sulphate against

K M n O_{4}

3

N a O H

against

H C l

4

N a O H

against

H_{2} S O_{4}

Explanation:

(b) Phenolphthalein is an indicator for strong base and weak acid, but $K M n O_{4}$ oxidises it.

PRACTICAL CHEMISTRY

37552 The correct match between items of

List-I	List-II
A. Coloured impurity	(p) Steam distillation
B. Mixture of o-nitrophenol and p-nitrophenol	(q) Fractional distillation
C. Crude naphtha	(r) Charcoal treatment
D. Mixture of glycerol and sugars	(s) Distillation under reduced pressure

1

(A) - (r), (B) - (s), (C) - (p), (D) - (q)

2

(A) - (p), (B) - (s), (C) - (r), (D) - (q)

3

(A) - (r), (B) - (p), (C) - (q), (D) - (s)

4

(A) - (r), (B) - (p), (C) - (s), (D) - (q)

Explanation:

$(a)$ Charcoal treatment removes coloured impurity through adsorption.
$(b)$ Steam distillation separates the mixture of $o -$ nitrophenol and $p -$ nitrophenol. The onitrophenol is steam volatile ( due to intramolecular hydrogen bonding), and the para isomer is not volatile.
$(c)$ Fractional distillation separates crude naphtha. Naphtha is a flammable liquid hydrocarbon mixture.
$(d)$ Distillation under reduced pressure separates mixture of glycerol and sugars. Vacuum distillation lowers the boiling point and prevents decomposition.

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