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PRACTICAL CHEMISTRY

37581 Number of metal ions characterized by flame test among the following is____. ${Sr}^{2 +}, {Ba}^{2 +}, {Ca}^{2 +}, {Cu}^{2 +}, {Zn}^{2 +}, {Co}^{2 +}, {Fe}^{2 +}$

1

3

2

10

3

12

4

4

Explanation:

All the following metal ions will respond to flame test. ${Sr}^{2 +}, {Ba}^{2 +}, {Ca}^{2 +}, {Cu}^{2 +}$

PRACTICAL CHEMISTRY

37582 The compound that is white in color is

1 ammonium sulphide

2 lead sulphate

3 lead iodide

4 ammonium arsinomolybdate

PRACTICAL CHEMISTRY

37583 Molar mass of the salt from $NaBr, {NaNO}_{3}, KI$ and ${CaF}_{2}$ which does not evolve coloured vapours on heating with concentrated $H_{2} {SO}_{4}$ is___ $g$ ${m o l}^{- 1}$ , (Molar mass in $g {mol}^{- 1} : N : 23, N : 14, K : 39$ ,

1

78

2

80

3

85

4

90

Explanation:

${C a F}_{2}$ does not evolve any gas with concentrated $H_{2} {SO}_{4}$ .
$NaBr \to$ evolve ${Br}_{2}$
${NaNO}_{3} \to$ evolve ${NO}_{2}$
$KI \to$ evolve $I_{2}$

PRACTICAL CHEMISTRY

37584 Given below are two statements :Statement $(I)$ : Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution.Statement $(I I)$ : In this titration phenolphthalein can be used as indicator.In the light of the above statements, choose the most appropriate answer from the options given below:

1 Both Statement

I

and Statement

I I

are correct

2 Statement

I

is correct but Statement

I I

is incorrect

3 Statement

I

is incorrect but Statement

I I

is correct

4 Both Statement

I

and Statement

I I

are incorrect

Explanation:

Statement $(I)$ : Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution as it is economical and its concentration does not changes with time.
Phenophthalin can acts as indicator in acid base titration as it shows colour in $pH$ range $8.3$ to $10.1$

PRACTICAL CHEMISTRY

37581 Number of metal ions characterized by flame test among the following is____. ${Sr}^{2 +}, {Ba}^{2 +}, {Ca}^{2 +}, {Cu}^{2 +}, {Zn}^{2 +}, {Co}^{2 +}, {Fe}^{2 +}$

1

3

2

10

3

12

4

4

Explanation:

All the following metal ions will respond to flame test. ${Sr}^{2 +}, {Ba}^{2 +}, {Ca}^{2 +}, {Cu}^{2 +}$

PRACTICAL CHEMISTRY

37582 The compound that is white in color is

1 ammonium sulphide

2 lead sulphate

3 lead iodide

4 ammonium arsinomolybdate

PRACTICAL CHEMISTRY

37583 Molar mass of the salt from $NaBr, {NaNO}_{3}, KI$ and ${CaF}_{2}$ which does not evolve coloured vapours on heating with concentrated $H_{2} {SO}_{4}$ is___ $g$ ${m o l}^{- 1}$ , (Molar mass in $g {mol}^{- 1} : N : 23, N : 14, K : 39$ ,

1

78

2

80

3

85

4

90

Explanation:

${C a F}_{2}$ does not evolve any gas with concentrated $H_{2} {SO}_{4}$ .
$NaBr \to$ evolve ${Br}_{2}$
${NaNO}_{3} \to$ evolve ${NO}_{2}$
$KI \to$ evolve $I_{2}$

PRACTICAL CHEMISTRY

37584 Given below are two statements :Statement $(I)$ : Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution.Statement $(I I)$ : In this titration phenolphthalein can be used as indicator.In the light of the above statements, choose the most appropriate answer from the options given below:

1 Both Statement

I

and Statement

I I

are correct

2 Statement

I

is correct but Statement

I I

is incorrect

3 Statement

I

is incorrect but Statement

I I

is correct

4 Both Statement

I

and Statement

I I

are incorrect

Explanation:

Statement $(I)$ : Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution as it is economical and its concentration does not changes with time.
Phenophthalin can acts as indicator in acid base titration as it shows colour in $pH$ range $8.3$ to $10.1$

PRACTICAL CHEMISTRY

37581 Number of metal ions characterized by flame test among the following is____. ${Sr}^{2 +}, {Ba}^{2 +}, {Ca}^{2 +}, {Cu}^{2 +}, {Zn}^{2 +}, {Co}^{2 +}, {Fe}^{2 +}$

1

3

2

10

3

12

4

4

Explanation:

All the following metal ions will respond to flame test. ${Sr}^{2 +}, {Ba}^{2 +}, {Ca}^{2 +}, {Cu}^{2 +}$

PRACTICAL CHEMISTRY

37582 The compound that is white in color is

1 ammonium sulphide

2 lead sulphate

3 lead iodide

4 ammonium arsinomolybdate

PRACTICAL CHEMISTRY

37583 Molar mass of the salt from $NaBr, {NaNO}_{3}, KI$ and ${CaF}_{2}$ which does not evolve coloured vapours on heating with concentrated $H_{2} {SO}_{4}$ is___ $g$ ${m o l}^{- 1}$ , (Molar mass in $g {mol}^{- 1} : N : 23, N : 14, K : 39$ ,

1

78

2

80

3

85

4

90

Explanation:

${C a F}_{2}$ does not evolve any gas with concentrated $H_{2} {SO}_{4}$ .
$NaBr \to$ evolve ${Br}_{2}$
${NaNO}_{3} \to$ evolve ${NO}_{2}$
$KI \to$ evolve $I_{2}$

PRACTICAL CHEMISTRY

37584 Given below are two statements :Statement $(I)$ : Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution.Statement $(I I)$ : In this titration phenolphthalein can be used as indicator.In the light of the above statements, choose the most appropriate answer from the options given below:

1 Both Statement

I

and Statement

I I

are correct

2 Statement

I

is correct but Statement

I I

is incorrect

3 Statement

I

is incorrect but Statement

I I

is correct

4 Both Statement

I

and Statement

I I

are incorrect

Explanation:

Statement $(I)$ : Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution as it is economical and its concentration does not changes with time.
Phenophthalin can acts as indicator in acid base titration as it shows colour in $pH$ range $8.3$ to $10.1$

PRACTICAL CHEMISTRY

37581 Number of metal ions characterized by flame test among the following is____. ${Sr}^{2 +}, {Ba}^{2 +}, {Ca}^{2 +}, {Cu}^{2 +}, {Zn}^{2 +}, {Co}^{2 +}, {Fe}^{2 +}$

1

3

2

10

3

12

4

4

Explanation:

All the following metal ions will respond to flame test. ${Sr}^{2 +}, {Ba}^{2 +}, {Ca}^{2 +}, {Cu}^{2 +}$

PRACTICAL CHEMISTRY

37582 The compound that is white in color is

1 ammonium sulphide

2 lead sulphate

3 lead iodide

4 ammonium arsinomolybdate

PRACTICAL CHEMISTRY

37583 Molar mass of the salt from $NaBr, {NaNO}_{3}, KI$ and ${CaF}_{2}$ which does not evolve coloured vapours on heating with concentrated $H_{2} {SO}_{4}$ is___ $g$ ${m o l}^{- 1}$ , (Molar mass in $g {mol}^{- 1} : N : 23, N : 14, K : 39$ ,

1

78

2

80

3

85

4

90

Explanation:

${C a F}_{2}$ does not evolve any gas with concentrated $H_{2} {SO}_{4}$ .
$NaBr \to$ evolve ${Br}_{2}$
${NaNO}_{3} \to$ evolve ${NO}_{2}$
$KI \to$ evolve $I_{2}$

PRACTICAL CHEMISTRY

37584 Given below are two statements :Statement $(I)$ : Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution.Statement $(I I)$ : In this titration phenolphthalein can be used as indicator.In the light of the above statements, choose the most appropriate answer from the options given below:

1 Both Statement

I

and Statement

I I

are correct

2 Statement

I

is correct but Statement

I I

is incorrect

3 Statement

I

is incorrect but Statement

I I

is correct

4 Both Statement

I

and Statement

I I

are incorrect

Explanation:

Statement $(I)$ : Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution as it is economical and its concentration does not changes with time.
Phenophthalin can acts as indicator in acid base titration as it shows colour in $pH$ range $8.3$ to $10.1$

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