QBManager

CHXI10:THE S-BLOCK ELEMENTS

315922 If ${Na}^{+}$ ion is larger than ${Mg}^{2 +}$ ions and $S^{2 -}$ ion is larger than ${Cl}^{-}$ ion, which of the following will be stable salt in water?

1 Sodium chloride

2 Sodium sulphide

3 Magnesium sulphide

4 Magnesium chloride

Explanation:

Higher the lattice energy, lower the solubility and more stable will be the salt in water. Since lattice energy varies directly with charge, among the four combinations given, the lattice energy of $MgS$ is higher than those of ${Na}_{2} S, {MgCl}_{2}$ and $NaCl$ . Hence, $MgS$ is a stable salt in water and the least soluble salt.

CHXI10:THE S-BLOCK ELEMENTS

315923 Which of the following metal ions plays an important role in muscle contraction?

1

K^{+}

2

{Na}^{+}

3

{Mg}^{2 +}

4

{Ca}^{2 +}

CHXI10:THE S-BLOCK ELEMENTS

315924 In which of the following cases the covalent character and the melting point order are same

1

{BeCl}_{2}, {CaCl}_{2}, {BaCl}_{2}

2

NaCl, {MgCl}_{2}, {AlCl}_{3}

3

{MgBr}_{2}, {SrBr}_{2}, {BaBr}_{2}

4

NaF, {MgF}_{2}, {AlF}_{3}

CHXI10:THE S-BLOCK ELEMENTS

315925 Which liberates ammonia when treated with water?

1

L i_{3} N

2

M g_{3} N_{2}

3

{CaCN}_{2}

4 All

Explanation:

All nitrides $(L i_{3} N, M g_{3} N_{2})$ to give ${NH}_{3}$ . ${CaCN}_{2}$ also react with $H_{2} O$ to give ${NH}_{3}$ .
${CaCN}_{2} + 3 H_{2} O \to {CaCO}_{3} + 2 {NH}_{3} .$

CHXI10:THE S-BLOCK ELEMENTS

315926 ${Na}_{2} {CO}_{3}$ cannot be used in place of ${({NH}_{4})}_{2} {CO}_{3}$ for identification of ${Ca}^{2 +}, {Ba}^{2 +}$ and ${Sr}^{2 +}$ ions because

1 Concentration of

{CO}_{3}^{2 -}

ions is very low

2

{Na}^{+}

ions will interfere with the detection of

{Ca}^{2 +}, {Sr}^{2 +}

and

{Ba}^{2 +}

3 Sodium will react with acid radicals

4 Magnesium if present, will be precipitated

CHXI10:THE S-BLOCK ELEMENTS

315922 If ${Na}^{+}$ ion is larger than ${Mg}^{2 +}$ ions and $S^{2 -}$ ion is larger than ${Cl}^{-}$ ion, which of the following will be stable salt in water?

1 Sodium chloride

2 Sodium sulphide

3 Magnesium sulphide

4 Magnesium chloride

Explanation:

Higher the lattice energy, lower the solubility and more stable will be the salt in water. Since lattice energy varies directly with charge, among the four combinations given, the lattice energy of $MgS$ is higher than those of ${Na}_{2} S, {MgCl}_{2}$ and $NaCl$ . Hence, $MgS$ is a stable salt in water and the least soluble salt.

CHXI10:THE S-BLOCK ELEMENTS

315923 Which of the following metal ions plays an important role in muscle contraction?

1

K^{+}

2

{Na}^{+}

3

{Mg}^{2 +}

4

{Ca}^{2 +}

CHXI10:THE S-BLOCK ELEMENTS

315924 In which of the following cases the covalent character and the melting point order are same

1

{BeCl}_{2}, {CaCl}_{2}, {BaCl}_{2}

2

NaCl, {MgCl}_{2}, {AlCl}_{3}

3

{MgBr}_{2}, {SrBr}_{2}, {BaBr}_{2}

4

NaF, {MgF}_{2}, {AlF}_{3}

CHXI10:THE S-BLOCK ELEMENTS

315925 Which liberates ammonia when treated with water?

1

L i_{3} N

2

M g_{3} N_{2}

3

{CaCN}_{2}

4 All

Explanation:

All nitrides $(L i_{3} N, M g_{3} N_{2})$ to give ${NH}_{3}$ . ${CaCN}_{2}$ also react with $H_{2} O$ to give ${NH}_{3}$ .
${CaCN}_{2} + 3 H_{2} O \to {CaCO}_{3} + 2 {NH}_{3} .$

CHXI10:THE S-BLOCK ELEMENTS

315926 ${Na}_{2} {CO}_{3}$ cannot be used in place of ${({NH}_{4})}_{2} {CO}_{3}$ for identification of ${Ca}^{2 +}, {Ba}^{2 +}$ and ${Sr}^{2 +}$ ions because

1 Concentration of

{CO}_{3}^{2 -}

ions is very low

2

{Na}^{+}

ions will interfere with the detection of

{Ca}^{2 +}, {Sr}^{2 +}

and

{Ba}^{2 +}

3 Sodium will react with acid radicals

4 Magnesium if present, will be precipitated

CHXI10:THE S-BLOCK ELEMENTS

315922 If ${Na}^{+}$ ion is larger than ${Mg}^{2 +}$ ions and $S^{2 -}$ ion is larger than ${Cl}^{-}$ ion, which of the following will be stable salt in water?

1 Sodium chloride

2 Sodium sulphide

3 Magnesium sulphide

4 Magnesium chloride

Explanation:

Higher the lattice energy, lower the solubility and more stable will be the salt in water. Since lattice energy varies directly with charge, among the four combinations given, the lattice energy of $MgS$ is higher than those of ${Na}_{2} S, {MgCl}_{2}$ and $NaCl$ . Hence, $MgS$ is a stable salt in water and the least soluble salt.

CHXI10:THE S-BLOCK ELEMENTS

315923 Which of the following metal ions plays an important role in muscle contraction?

1

K^{+}

2

{Na}^{+}

3

{Mg}^{2 +}

4

{Ca}^{2 +}

CHXI10:THE S-BLOCK ELEMENTS

315924 In which of the following cases the covalent character and the melting point order are same

1

{BeCl}_{2}, {CaCl}_{2}, {BaCl}_{2}

2

NaCl, {MgCl}_{2}, {AlCl}_{3}

3

{MgBr}_{2}, {SrBr}_{2}, {BaBr}_{2}

4

NaF, {MgF}_{2}, {AlF}_{3}

CHXI10:THE S-BLOCK ELEMENTS

315925 Which liberates ammonia when treated with water?

1

L i_{3} N

2

M g_{3} N_{2}

3

{CaCN}_{2}

4 All

Explanation:

All nitrides $(L i_{3} N, M g_{3} N_{2})$ to give ${NH}_{3}$ . ${CaCN}_{2}$ also react with $H_{2} O$ to give ${NH}_{3}$ .
${CaCN}_{2} + 3 H_{2} O \to {CaCO}_{3} + 2 {NH}_{3} .$

CHXI10:THE S-BLOCK ELEMENTS

315926 ${Na}_{2} {CO}_{3}$ cannot be used in place of ${({NH}_{4})}_{2} {CO}_{3}$ for identification of ${Ca}^{2 +}, {Ba}^{2 +}$ and ${Sr}^{2 +}$ ions because

1 Concentration of

{CO}_{3}^{2 -}

ions is very low

2

{Na}^{+}

ions will interfere with the detection of

{Ca}^{2 +}, {Sr}^{2 +}

and

{Ba}^{2 +}

3 Sodium will react with acid radicals

4 Magnesium if present, will be precipitated

CHXI10:THE S-BLOCK ELEMENTS

315922 If ${Na}^{+}$ ion is larger than ${Mg}^{2 +}$ ions and $S^{2 -}$ ion is larger than ${Cl}^{-}$ ion, which of the following will be stable salt in water?

1 Sodium chloride

2 Sodium sulphide

3 Magnesium sulphide

4 Magnesium chloride

Explanation:

Higher the lattice energy, lower the solubility and more stable will be the salt in water. Since lattice energy varies directly with charge, among the four combinations given, the lattice energy of $MgS$ is higher than those of ${Na}_{2} S, {MgCl}_{2}$ and $NaCl$ . Hence, $MgS$ is a stable salt in water and the least soluble salt.

CHXI10:THE S-BLOCK ELEMENTS

315923 Which of the following metal ions plays an important role in muscle contraction?

1

K^{+}

2

{Na}^{+}

3

{Mg}^{2 +}

4

{Ca}^{2 +}

CHXI10:THE S-BLOCK ELEMENTS

315924 In which of the following cases the covalent character and the melting point order are same

1

{BeCl}_{2}, {CaCl}_{2}, {BaCl}_{2}

2

NaCl, {MgCl}_{2}, {AlCl}_{3}

3

{MgBr}_{2}, {SrBr}_{2}, {BaBr}_{2}

4

NaF, {MgF}_{2}, {AlF}_{3}

CHXI10:THE S-BLOCK ELEMENTS

315925 Which liberates ammonia when treated with water?

1

L i_{3} N

2

M g_{3} N_{2}

3

{CaCN}_{2}

4 All

Explanation:

All nitrides $(L i_{3} N, M g_{3} N_{2})$ to give ${NH}_{3}$ . ${CaCN}_{2}$ also react with $H_{2} O$ to give ${NH}_{3}$ .
${CaCN}_{2} + 3 H_{2} O \to {CaCO}_{3} + 2 {NH}_{3} .$

CHXI10:THE S-BLOCK ELEMENTS

315926 ${Na}_{2} {CO}_{3}$ cannot be used in place of ${({NH}_{4})}_{2} {CO}_{3}$ for identification of ${Ca}^{2 +}, {Ba}^{2 +}$ and ${Sr}^{2 +}$ ions because

1 Concentration of

{CO}_{3}^{2 -}

ions is very low

2

{Na}^{+}

ions will interfere with the detection of

{Ca}^{2 +}, {Sr}^{2 +}

and

{Ba}^{2 +}

3 Sodium will react with acid radicals

4 Magnesium if present, will be precipitated

CHXI10:THE S-BLOCK ELEMENTS

315922 If ${Na}^{+}$ ion is larger than ${Mg}^{2 +}$ ions and $S^{2 -}$ ion is larger than ${Cl}^{-}$ ion, which of the following will be stable salt in water?

1 Sodium chloride

2 Sodium sulphide

3 Magnesium sulphide

4 Magnesium chloride

Explanation:

Higher the lattice energy, lower the solubility and more stable will be the salt in water. Since lattice energy varies directly with charge, among the four combinations given, the lattice energy of $MgS$ is higher than those of ${Na}_{2} S, {MgCl}_{2}$ and $NaCl$ . Hence, $MgS$ is a stable salt in water and the least soluble salt.

CHXI10:THE S-BLOCK ELEMENTS

315923 Which of the following metal ions plays an important role in muscle contraction?

1

K^{+}

2

{Na}^{+}

3

{Mg}^{2 +}

4

{Ca}^{2 +}

CHXI10:THE S-BLOCK ELEMENTS

315924 In which of the following cases the covalent character and the melting point order are same

1

{BeCl}_{2}, {CaCl}_{2}, {BaCl}_{2}

2

NaCl, {MgCl}_{2}, {AlCl}_{3}

3

{MgBr}_{2}, {SrBr}_{2}, {BaBr}_{2}

4

NaF, {MgF}_{2}, {AlF}_{3}

CHXI10:THE S-BLOCK ELEMENTS

315925 Which liberates ammonia when treated with water?

1

L i_{3} N

2

M g_{3} N_{2}

3

{CaCN}_{2}

4 All

Explanation:

All nitrides $(L i_{3} N, M g_{3} N_{2})$ to give ${NH}_{3}$ . ${CaCN}_{2}$ also react with $H_{2} O$ to give ${NH}_{3}$ .
${CaCN}_{2} + 3 H_{2} O \to {CaCO}_{3} + 2 {NH}_{3} .$

CHXI10:THE S-BLOCK ELEMENTS

315926 ${Na}_{2} {CO}_{3}$ cannot be used in place of ${({NH}_{4})}_{2} {CO}_{3}$ for identification of ${Ca}^{2 +}, {Ba}^{2 +}$ and ${Sr}^{2 +}$ ions because

1 Concentration of

{CO}_{3}^{2 -}

ions is very low

2

{Na}^{+}

ions will interfere with the detection of

{Ca}^{2 +}, {Sr}^{2 +}

and

{Ba}^{2 +}

3 Sodium will react with acid radicals

4 Magnesium if present, will be precipitated