316472
Which of the following properties describes the diagonal relationship between boron and silicon?
1 \(\mathrm{BCl}_{3}\) is not hydrolyzed while \(\mathrm{SiCl}_{4}\) can be hydrolyzed.
2 Both form oxides: \(\mathrm{B}_{2} \mathrm{O}_{3}\) is amphoteric; \(\mathrm{SiO}_{2}\) is acidic.
3 Both B and Si dissolve in cold and dilute nitric acid
4 Borides and silicides are hydrolyzed by water.
Explanation:
Borides and silicides are hydrolyzed in water showing the diagonal relationship of boron and sillicon.
CHXI11:THE P-BLOCK ELEMENTS
316473
Boron does not form \({{\text{B}}^{{\text{3 + }}}}\) ions whereas \({\text{Al}}\) forms \(\mathrm{Al}^{3+}\) ions. This is because :
1 The size of \({\text{B}}\) atom is smaller than that of \(\mathrm{Al}\)
2 The sum of \(\left( {{\text{I}}{{\text{E}}_{\text{1}}}{\text{ + I}}{{\text{E}}_{\text{2}}}{\text{ + I}}{{\text{E}}_{\text{3}}}} \right)\) of B is much higher than that of \({\text{Al}}\)
3 The sum of \(\left( {{\text{I}}{{\text{E}}_{\text{1}}}{\text{ + I}}{{\text{E}}_{\text{2}}}{\text{ + I}}{{\text{E}}_{\text{3}}}} \right)\) of \({\rm{Al}}\) is much higher than that of \(\mathrm{B}\)
4 Both (1) and (2)
Explanation:
Conceptual Questions
CHXI11:THE P-BLOCK ELEMENTS
316474
The first ionization enthalpy of aluminium is smaller than that of magnesium because
1 Atomic size of \(\mathrm{Al}>\mathrm{Mg}\)
2 "Al" has one electron in the less penetrating p-orbital.
3 \(\mathrm{Mg}\) has one electron in the p-orbital
4 Atomic number of \(\mathrm{Al}>\mathrm{Mg}\)
Explanation:
In case of \(\mathrm{Al}\), the electron is to be removed from less penetrating \(\mathrm{p}\)-orbital as compared to \(\mathrm{Mg}\) where the electron is to be removed from more penetrating and completely filled s-orbital. Hence \(\mathrm{IE}_{1}\) of \(\mathrm{Al}\) is smaller than that of Mg.
CHXI11:THE P-BLOCK ELEMENTS
316475
Read the Statement A and Statement B carefully and mark the correct option. Statement A : The decrease in first ionisation enthalpy from B to Al is much larger than that from Al to Ga . Statement B : The d – orbitals in Ga are completely filled.
1 Statement A is incorrect but statement B is correct.
2 Both the statements A and B are correct.
3 Statement A is correct but statement B is incorrect.
4 Both the statements A and B are incorrect.
Explanation:
The decrease in first ionisation enthalpy from B to Al is associated with increase in size. The discontinuity between Al and Ga is due to low screening effect of d – electrons. \[\begin{array}{*{20}{c}} {{{\text{I}}^{{\text{st }}}}{\text{Ionisation}}\,\,{\text{enthalpy}}\,({\text{kJ}}/{\text{mol}})}&{\text{B}}&{{\text{Al}}}&{{\text{Ga}}} \\ {}&{801}&{577}&{579} \end{array}\] In \(\mathrm{Ga}:[\mathrm{Ar}] 3 \mathrm{~d}^{10} 4 \mathrm{~s}^{2} 4 \mathrm{p}^{1}, \mathrm{~d}\) – orbitals in Ga are completely filled.
316472
Which of the following properties describes the diagonal relationship between boron and silicon?
1 \(\mathrm{BCl}_{3}\) is not hydrolyzed while \(\mathrm{SiCl}_{4}\) can be hydrolyzed.
2 Both form oxides: \(\mathrm{B}_{2} \mathrm{O}_{3}\) is amphoteric; \(\mathrm{SiO}_{2}\) is acidic.
3 Both B and Si dissolve in cold and dilute nitric acid
4 Borides and silicides are hydrolyzed by water.
Explanation:
Borides and silicides are hydrolyzed in water showing the diagonal relationship of boron and sillicon.
CHXI11:THE P-BLOCK ELEMENTS
316473
Boron does not form \({{\text{B}}^{{\text{3 + }}}}\) ions whereas \({\text{Al}}\) forms \(\mathrm{Al}^{3+}\) ions. This is because :
1 The size of \({\text{B}}\) atom is smaller than that of \(\mathrm{Al}\)
2 The sum of \(\left( {{\text{I}}{{\text{E}}_{\text{1}}}{\text{ + I}}{{\text{E}}_{\text{2}}}{\text{ + I}}{{\text{E}}_{\text{3}}}} \right)\) of B is much higher than that of \({\text{Al}}\)
3 The sum of \(\left( {{\text{I}}{{\text{E}}_{\text{1}}}{\text{ + I}}{{\text{E}}_{\text{2}}}{\text{ + I}}{{\text{E}}_{\text{3}}}} \right)\) of \({\rm{Al}}\) is much higher than that of \(\mathrm{B}\)
4 Both (1) and (2)
Explanation:
Conceptual Questions
CHXI11:THE P-BLOCK ELEMENTS
316474
The first ionization enthalpy of aluminium is smaller than that of magnesium because
1 Atomic size of \(\mathrm{Al}>\mathrm{Mg}\)
2 "Al" has one electron in the less penetrating p-orbital.
3 \(\mathrm{Mg}\) has one electron in the p-orbital
4 Atomic number of \(\mathrm{Al}>\mathrm{Mg}\)
Explanation:
In case of \(\mathrm{Al}\), the electron is to be removed from less penetrating \(\mathrm{p}\)-orbital as compared to \(\mathrm{Mg}\) where the electron is to be removed from more penetrating and completely filled s-orbital. Hence \(\mathrm{IE}_{1}\) of \(\mathrm{Al}\) is smaller than that of Mg.
CHXI11:THE P-BLOCK ELEMENTS
316475
Read the Statement A and Statement B carefully and mark the correct option. Statement A : The decrease in first ionisation enthalpy from B to Al is much larger than that from Al to Ga . Statement B : The d – orbitals in Ga are completely filled.
1 Statement A is incorrect but statement B is correct.
2 Both the statements A and B are correct.
3 Statement A is correct but statement B is incorrect.
4 Both the statements A and B are incorrect.
Explanation:
The decrease in first ionisation enthalpy from B to Al is associated with increase in size. The discontinuity between Al and Ga is due to low screening effect of d – electrons. \[\begin{array}{*{20}{c}} {{{\text{I}}^{{\text{st }}}}{\text{Ionisation}}\,\,{\text{enthalpy}}\,({\text{kJ}}/{\text{mol}})}&{\text{B}}&{{\text{Al}}}&{{\text{Ga}}} \\ {}&{801}&{577}&{579} \end{array}\] In \(\mathrm{Ga}:[\mathrm{Ar}] 3 \mathrm{~d}^{10} 4 \mathrm{~s}^{2} 4 \mathrm{p}^{1}, \mathrm{~d}\) – orbitals in Ga are completely filled.
316472
Which of the following properties describes the diagonal relationship between boron and silicon?
1 \(\mathrm{BCl}_{3}\) is not hydrolyzed while \(\mathrm{SiCl}_{4}\) can be hydrolyzed.
2 Both form oxides: \(\mathrm{B}_{2} \mathrm{O}_{3}\) is amphoteric; \(\mathrm{SiO}_{2}\) is acidic.
3 Both B and Si dissolve in cold and dilute nitric acid
4 Borides and silicides are hydrolyzed by water.
Explanation:
Borides and silicides are hydrolyzed in water showing the diagonal relationship of boron and sillicon.
CHXI11:THE P-BLOCK ELEMENTS
316473
Boron does not form \({{\text{B}}^{{\text{3 + }}}}\) ions whereas \({\text{Al}}\) forms \(\mathrm{Al}^{3+}\) ions. This is because :
1 The size of \({\text{B}}\) atom is smaller than that of \(\mathrm{Al}\)
2 The sum of \(\left( {{\text{I}}{{\text{E}}_{\text{1}}}{\text{ + I}}{{\text{E}}_{\text{2}}}{\text{ + I}}{{\text{E}}_{\text{3}}}} \right)\) of B is much higher than that of \({\text{Al}}\)
3 The sum of \(\left( {{\text{I}}{{\text{E}}_{\text{1}}}{\text{ + I}}{{\text{E}}_{\text{2}}}{\text{ + I}}{{\text{E}}_{\text{3}}}} \right)\) of \({\rm{Al}}\) is much higher than that of \(\mathrm{B}\)
4 Both (1) and (2)
Explanation:
Conceptual Questions
CHXI11:THE P-BLOCK ELEMENTS
316474
The first ionization enthalpy of aluminium is smaller than that of magnesium because
1 Atomic size of \(\mathrm{Al}>\mathrm{Mg}\)
2 "Al" has one electron in the less penetrating p-orbital.
3 \(\mathrm{Mg}\) has one electron in the p-orbital
4 Atomic number of \(\mathrm{Al}>\mathrm{Mg}\)
Explanation:
In case of \(\mathrm{Al}\), the electron is to be removed from less penetrating \(\mathrm{p}\)-orbital as compared to \(\mathrm{Mg}\) where the electron is to be removed from more penetrating and completely filled s-orbital. Hence \(\mathrm{IE}_{1}\) of \(\mathrm{Al}\) is smaller than that of Mg.
CHXI11:THE P-BLOCK ELEMENTS
316475
Read the Statement A and Statement B carefully and mark the correct option. Statement A : The decrease in first ionisation enthalpy from B to Al is much larger than that from Al to Ga . Statement B : The d – orbitals in Ga are completely filled.
1 Statement A is incorrect but statement B is correct.
2 Both the statements A and B are correct.
3 Statement A is correct but statement B is incorrect.
4 Both the statements A and B are incorrect.
Explanation:
The decrease in first ionisation enthalpy from B to Al is associated with increase in size. The discontinuity between Al and Ga is due to low screening effect of d – electrons. \[\begin{array}{*{20}{c}} {{{\text{I}}^{{\text{st }}}}{\text{Ionisation}}\,\,{\text{enthalpy}}\,({\text{kJ}}/{\text{mol}})}&{\text{B}}&{{\text{Al}}}&{{\text{Ga}}} \\ {}&{801}&{577}&{579} \end{array}\] In \(\mathrm{Ga}:[\mathrm{Ar}] 3 \mathrm{~d}^{10} 4 \mathrm{~s}^{2} 4 \mathrm{p}^{1}, \mathrm{~d}\) – orbitals in Ga are completely filled.
316472
Which of the following properties describes the diagonal relationship between boron and silicon?
1 \(\mathrm{BCl}_{3}\) is not hydrolyzed while \(\mathrm{SiCl}_{4}\) can be hydrolyzed.
2 Both form oxides: \(\mathrm{B}_{2} \mathrm{O}_{3}\) is amphoteric; \(\mathrm{SiO}_{2}\) is acidic.
3 Both B and Si dissolve in cold and dilute nitric acid
4 Borides and silicides are hydrolyzed by water.
Explanation:
Borides and silicides are hydrolyzed in water showing the diagonal relationship of boron and sillicon.
CHXI11:THE P-BLOCK ELEMENTS
316473
Boron does not form \({{\text{B}}^{{\text{3 + }}}}\) ions whereas \({\text{Al}}\) forms \(\mathrm{Al}^{3+}\) ions. This is because :
1 The size of \({\text{B}}\) atom is smaller than that of \(\mathrm{Al}\)
2 The sum of \(\left( {{\text{I}}{{\text{E}}_{\text{1}}}{\text{ + I}}{{\text{E}}_{\text{2}}}{\text{ + I}}{{\text{E}}_{\text{3}}}} \right)\) of B is much higher than that of \({\text{Al}}\)
3 The sum of \(\left( {{\text{I}}{{\text{E}}_{\text{1}}}{\text{ + I}}{{\text{E}}_{\text{2}}}{\text{ + I}}{{\text{E}}_{\text{3}}}} \right)\) of \({\rm{Al}}\) is much higher than that of \(\mathrm{B}\)
4 Both (1) and (2)
Explanation:
Conceptual Questions
CHXI11:THE P-BLOCK ELEMENTS
316474
The first ionization enthalpy of aluminium is smaller than that of magnesium because
1 Atomic size of \(\mathrm{Al}>\mathrm{Mg}\)
2 "Al" has one electron in the less penetrating p-orbital.
3 \(\mathrm{Mg}\) has one electron in the p-orbital
4 Atomic number of \(\mathrm{Al}>\mathrm{Mg}\)
Explanation:
In case of \(\mathrm{Al}\), the electron is to be removed from less penetrating \(\mathrm{p}\)-orbital as compared to \(\mathrm{Mg}\) where the electron is to be removed from more penetrating and completely filled s-orbital. Hence \(\mathrm{IE}_{1}\) of \(\mathrm{Al}\) is smaller than that of Mg.
CHXI11:THE P-BLOCK ELEMENTS
316475
Read the Statement A and Statement B carefully and mark the correct option. Statement A : The decrease in first ionisation enthalpy from B to Al is much larger than that from Al to Ga . Statement B : The d – orbitals in Ga are completely filled.
1 Statement A is incorrect but statement B is correct.
2 Both the statements A and B are correct.
3 Statement A is correct but statement B is incorrect.
4 Both the statements A and B are incorrect.
Explanation:
The decrease in first ionisation enthalpy from B to Al is associated with increase in size. The discontinuity between Al and Ga is due to low screening effect of d – electrons. \[\begin{array}{*{20}{c}} {{{\text{I}}^{{\text{st }}}}{\text{Ionisation}}\,\,{\text{enthalpy}}\,({\text{kJ}}/{\text{mol}})}&{\text{B}}&{{\text{Al}}}&{{\text{Ga}}} \\ {}&{801}&{577}&{579} \end{array}\] In \(\mathrm{Ga}:[\mathrm{Ar}] 3 \mathrm{~d}^{10} 4 \mathrm{~s}^{2} 4 \mathrm{p}^{1}, \mathrm{~d}\) – orbitals in Ga are completely filled.
