315922
If \(\mathrm{Na}^{+}\)ion is larger than \(\mathrm{Mg}^{2+}\) ions and \(\mathrm{S}^{2-}\) ion is larger than \(\mathrm{Cl}^{-}\)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 \(\mathrm{MgS}\) is higher than those of \(\mathrm{Na}_{2} \mathrm{~S}, \mathrm{MgCl}_{2}\) and \(\mathrm{NaCl}\). Hence, \(\mathrm{MgS}\) 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 \(\mathrm{K}^{+}\)
2 \(\mathrm{Na}^{+}\)
3 \(\mathrm{Mg}^{2+}\)
4 \(\mathrm{Ca}^{2+}\)
Explanation:
Conceptual Questions
CHXI10:THE S-BLOCK ELEMENTS
315924
In which of the following cases the covalent character and the melting point order are same
All nitrides \(\left( {{\rm{L}}{{\rm{i}}_{\rm{3}}}{\rm{N,}}{\mkern 1mu} {\mkern 1mu} {\rm{M}}{{\rm{g}}_{\rm{3}}}{{\rm{N}}_{\rm{2}}}} \right)\) to give \(\mathrm{NH}_{3}\). \(\mathrm{CaCN}_{2}\) also react with \(\mathrm{H}_{2} \mathrm{O}\) to give \(\mathrm{NH}_{3}\). \(\mathrm{CaCN}_{2}+3 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{CaCO}_{3}+2 \mathrm{NH}_{3} .\)
CHXI10:THE S-BLOCK ELEMENTS
315926
\(\mathrm{Na}_{2} \mathrm{CO}_{3}\) cannot be used in place of \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}\) for identification of \(\mathrm{Ca}^{2+}, \mathrm{Ba}^{2+}\) and \(\mathrm{Sr}^{2+}\) ions because
1 Concentration of \(\mathrm{CO}_{3}^{2-}\) ions is very low
2 \(\mathrm{Na}^{+}\)ions will interfere with the detection of \(\mathrm{Ca}^{2+}, \mathrm{Sr}^{2+}\) and \(\mathrm{Ba}^{2+}\)
315922
If \(\mathrm{Na}^{+}\)ion is larger than \(\mathrm{Mg}^{2+}\) ions and \(\mathrm{S}^{2-}\) ion is larger than \(\mathrm{Cl}^{-}\)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 \(\mathrm{MgS}\) is higher than those of \(\mathrm{Na}_{2} \mathrm{~S}, \mathrm{MgCl}_{2}\) and \(\mathrm{NaCl}\). Hence, \(\mathrm{MgS}\) 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 \(\mathrm{K}^{+}\)
2 \(\mathrm{Na}^{+}\)
3 \(\mathrm{Mg}^{2+}\)
4 \(\mathrm{Ca}^{2+}\)
Explanation:
Conceptual Questions
CHXI10:THE S-BLOCK ELEMENTS
315924
In which of the following cases the covalent character and the melting point order are same
All nitrides \(\left( {{\rm{L}}{{\rm{i}}_{\rm{3}}}{\rm{N,}}{\mkern 1mu} {\mkern 1mu} {\rm{M}}{{\rm{g}}_{\rm{3}}}{{\rm{N}}_{\rm{2}}}} \right)\) to give \(\mathrm{NH}_{3}\). \(\mathrm{CaCN}_{2}\) also react with \(\mathrm{H}_{2} \mathrm{O}\) to give \(\mathrm{NH}_{3}\). \(\mathrm{CaCN}_{2}+3 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{CaCO}_{3}+2 \mathrm{NH}_{3} .\)
CHXI10:THE S-BLOCK ELEMENTS
315926
\(\mathrm{Na}_{2} \mathrm{CO}_{3}\) cannot be used in place of \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}\) for identification of \(\mathrm{Ca}^{2+}, \mathrm{Ba}^{2+}\) and \(\mathrm{Sr}^{2+}\) ions because
1 Concentration of \(\mathrm{CO}_{3}^{2-}\) ions is very low
2 \(\mathrm{Na}^{+}\)ions will interfere with the detection of \(\mathrm{Ca}^{2+}, \mathrm{Sr}^{2+}\) and \(\mathrm{Ba}^{2+}\)
315922
If \(\mathrm{Na}^{+}\)ion is larger than \(\mathrm{Mg}^{2+}\) ions and \(\mathrm{S}^{2-}\) ion is larger than \(\mathrm{Cl}^{-}\)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 \(\mathrm{MgS}\) is higher than those of \(\mathrm{Na}_{2} \mathrm{~S}, \mathrm{MgCl}_{2}\) and \(\mathrm{NaCl}\). Hence, \(\mathrm{MgS}\) 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 \(\mathrm{K}^{+}\)
2 \(\mathrm{Na}^{+}\)
3 \(\mathrm{Mg}^{2+}\)
4 \(\mathrm{Ca}^{2+}\)
Explanation:
Conceptual Questions
CHXI10:THE S-BLOCK ELEMENTS
315924
In which of the following cases the covalent character and the melting point order are same
All nitrides \(\left( {{\rm{L}}{{\rm{i}}_{\rm{3}}}{\rm{N,}}{\mkern 1mu} {\mkern 1mu} {\rm{M}}{{\rm{g}}_{\rm{3}}}{{\rm{N}}_{\rm{2}}}} \right)\) to give \(\mathrm{NH}_{3}\). \(\mathrm{CaCN}_{2}\) also react with \(\mathrm{H}_{2} \mathrm{O}\) to give \(\mathrm{NH}_{3}\). \(\mathrm{CaCN}_{2}+3 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{CaCO}_{3}+2 \mathrm{NH}_{3} .\)
CHXI10:THE S-BLOCK ELEMENTS
315926
\(\mathrm{Na}_{2} \mathrm{CO}_{3}\) cannot be used in place of \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}\) for identification of \(\mathrm{Ca}^{2+}, \mathrm{Ba}^{2+}\) and \(\mathrm{Sr}^{2+}\) ions because
1 Concentration of \(\mathrm{CO}_{3}^{2-}\) ions is very low
2 \(\mathrm{Na}^{+}\)ions will interfere with the detection of \(\mathrm{Ca}^{2+}, \mathrm{Sr}^{2+}\) and \(\mathrm{Ba}^{2+}\)
315922
If \(\mathrm{Na}^{+}\)ion is larger than \(\mathrm{Mg}^{2+}\) ions and \(\mathrm{S}^{2-}\) ion is larger than \(\mathrm{Cl}^{-}\)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 \(\mathrm{MgS}\) is higher than those of \(\mathrm{Na}_{2} \mathrm{~S}, \mathrm{MgCl}_{2}\) and \(\mathrm{NaCl}\). Hence, \(\mathrm{MgS}\) 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 \(\mathrm{K}^{+}\)
2 \(\mathrm{Na}^{+}\)
3 \(\mathrm{Mg}^{2+}\)
4 \(\mathrm{Ca}^{2+}\)
Explanation:
Conceptual Questions
CHXI10:THE S-BLOCK ELEMENTS
315924
In which of the following cases the covalent character and the melting point order are same
All nitrides \(\left( {{\rm{L}}{{\rm{i}}_{\rm{3}}}{\rm{N,}}{\mkern 1mu} {\mkern 1mu} {\rm{M}}{{\rm{g}}_{\rm{3}}}{{\rm{N}}_{\rm{2}}}} \right)\) to give \(\mathrm{NH}_{3}\). \(\mathrm{CaCN}_{2}\) also react with \(\mathrm{H}_{2} \mathrm{O}\) to give \(\mathrm{NH}_{3}\). \(\mathrm{CaCN}_{2}+3 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{CaCO}_{3}+2 \mathrm{NH}_{3} .\)
CHXI10:THE S-BLOCK ELEMENTS
315926
\(\mathrm{Na}_{2} \mathrm{CO}_{3}\) cannot be used in place of \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}\) for identification of \(\mathrm{Ca}^{2+}, \mathrm{Ba}^{2+}\) and \(\mathrm{Sr}^{2+}\) ions because
1 Concentration of \(\mathrm{CO}_{3}^{2-}\) ions is very low
2 \(\mathrm{Na}^{+}\)ions will interfere with the detection of \(\mathrm{Ca}^{2+}, \mathrm{Sr}^{2+}\) and \(\mathrm{Ba}^{2+}\)
315922
If \(\mathrm{Na}^{+}\)ion is larger than \(\mathrm{Mg}^{2+}\) ions and \(\mathrm{S}^{2-}\) ion is larger than \(\mathrm{Cl}^{-}\)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 \(\mathrm{MgS}\) is higher than those of \(\mathrm{Na}_{2} \mathrm{~S}, \mathrm{MgCl}_{2}\) and \(\mathrm{NaCl}\). Hence, \(\mathrm{MgS}\) 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 \(\mathrm{K}^{+}\)
2 \(\mathrm{Na}^{+}\)
3 \(\mathrm{Mg}^{2+}\)
4 \(\mathrm{Ca}^{2+}\)
Explanation:
Conceptual Questions
CHXI10:THE S-BLOCK ELEMENTS
315924
In which of the following cases the covalent character and the melting point order are same
All nitrides \(\left( {{\rm{L}}{{\rm{i}}_{\rm{3}}}{\rm{N,}}{\mkern 1mu} {\mkern 1mu} {\rm{M}}{{\rm{g}}_{\rm{3}}}{{\rm{N}}_{\rm{2}}}} \right)\) to give \(\mathrm{NH}_{3}\). \(\mathrm{CaCN}_{2}\) also react with \(\mathrm{H}_{2} \mathrm{O}\) to give \(\mathrm{NH}_{3}\). \(\mathrm{CaCN}_{2}+3 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{CaCO}_{3}+2 \mathrm{NH}_{3} .\)
CHXI10:THE S-BLOCK ELEMENTS
315926
\(\mathrm{Na}_{2} \mathrm{CO}_{3}\) cannot be used in place of \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}\) for identification of \(\mathrm{Ca}^{2+}, \mathrm{Ba}^{2+}\) and \(\mathrm{Sr}^{2+}\) ions because
1 Concentration of \(\mathrm{CO}_{3}^{2-}\) ions is very low
2 \(\mathrm{Na}^{+}\)ions will interfere with the detection of \(\mathrm{Ca}^{2+}, \mathrm{Sr}^{2+}\) and \(\mathrm{Ba}^{2+}\)
