316580
The physical properties of group-16 elements are I. polonium is a metal and is radioactive II. all these elements exhibit allotropy III. with increase in atomic number, the melting and boiling points increase down the group The option with correct set of properties is
1 Both I and II
2 Both II and III
3 Both I and III
4 I, II and III
Explanation:
Oxygen and sulphur are non-metals, selenium and tellurium are metalloids, whereas polonium is a radioactive element. It is short lived (halflife 13.8 days). All these elements exhibit allotropy. The melting and boiling points increase with an increase in atomic number down the group. So, the option (4) is correct.
CHXI11:THE P-BLOCK ELEMENTS
316581
Why is dioxygen a gas but sulphur a solid?
1 Sulphur has strong tendency to form \({\rm{p\pi - p\pi }}\) bond
2 Due to small size oxygen has strong tendency to form \({\rm{p\pi - p\pi }}\) bond and exist as diatomic gas
3 Sulphur is larger in size hence exists as solid
4 Oxygen has less reactivity than sulphur
Explanation:
CHXI11:THE P-BLOCK ELEMENTS
316582
Assertion : \(\mathrm{F}-\mathrm{F}\) bond has low bond dissociation energy. Reason : The fluorine has lower reactivity.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
The lower bond dissociation energy in fluorine \((\mathrm{F}-\mathrm{F})\) is due to heightened interelectronic repulsions in its small-sized 2p-orbital. This makes \(\mathrm{F}-\mathrm{F}\) bond weaker compared to \(\mathrm{Cl}\) \(-\mathrm{Cl}\) and \(\mathrm{Br}-\mathrm{Br}\) bonds. Bond dissociation energies are: \({\text{F - F(38 k cal/mol),Cl - Cl(57 k cal/mol)}}\) \({\text{Br - Br (45}}{\text{.5 k cal/mol) ,}}\) and \({\text{I - I (35}}{\text{.6 k cal/mol)}}.\) \({{\text{F}}_2}\) is highly reactive non metal. So option (3) is correct.
CHXI11:THE P-BLOCK ELEMENTS
316583
Which among the following factors is the most important in making fluorine the strongest oxidizing agent?
1 Electron affinity
2 Ionization enthalpy
3 Hydration enthalpy
4 Bond dissociation energy
Explanation:
\(F_{2}\) has the most negative \(\Delta {\rm{G}}^\circ \) value which is dependent on hydration enthalpy.
316580
The physical properties of group-16 elements are I. polonium is a metal and is radioactive II. all these elements exhibit allotropy III. with increase in atomic number, the melting and boiling points increase down the group The option with correct set of properties is
1 Both I and II
2 Both II and III
3 Both I and III
4 I, II and III
Explanation:
Oxygen and sulphur are non-metals, selenium and tellurium are metalloids, whereas polonium is a radioactive element. It is short lived (halflife 13.8 days). All these elements exhibit allotropy. The melting and boiling points increase with an increase in atomic number down the group. So, the option (4) is correct.
CHXI11:THE P-BLOCK ELEMENTS
316581
Why is dioxygen a gas but sulphur a solid?
1 Sulphur has strong tendency to form \({\rm{p\pi - p\pi }}\) bond
2 Due to small size oxygen has strong tendency to form \({\rm{p\pi - p\pi }}\) bond and exist as diatomic gas
3 Sulphur is larger in size hence exists as solid
4 Oxygen has less reactivity than sulphur
Explanation:
CHXI11:THE P-BLOCK ELEMENTS
316582
Assertion : \(\mathrm{F}-\mathrm{F}\) bond has low bond dissociation energy. Reason : The fluorine has lower reactivity.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
The lower bond dissociation energy in fluorine \((\mathrm{F}-\mathrm{F})\) is due to heightened interelectronic repulsions in its small-sized 2p-orbital. This makes \(\mathrm{F}-\mathrm{F}\) bond weaker compared to \(\mathrm{Cl}\) \(-\mathrm{Cl}\) and \(\mathrm{Br}-\mathrm{Br}\) bonds. Bond dissociation energies are: \({\text{F - F(38 k cal/mol),Cl - Cl(57 k cal/mol)}}\) \({\text{Br - Br (45}}{\text{.5 k cal/mol) ,}}\) and \({\text{I - I (35}}{\text{.6 k cal/mol)}}.\) \({{\text{F}}_2}\) is highly reactive non metal. So option (3) is correct.
CHXI11:THE P-BLOCK ELEMENTS
316583
Which among the following factors is the most important in making fluorine the strongest oxidizing agent?
1 Electron affinity
2 Ionization enthalpy
3 Hydration enthalpy
4 Bond dissociation energy
Explanation:
\(F_{2}\) has the most negative \(\Delta {\rm{G}}^\circ \) value which is dependent on hydration enthalpy.
316580
The physical properties of group-16 elements are I. polonium is a metal and is radioactive II. all these elements exhibit allotropy III. with increase in atomic number, the melting and boiling points increase down the group The option with correct set of properties is
1 Both I and II
2 Both II and III
3 Both I and III
4 I, II and III
Explanation:
Oxygen and sulphur are non-metals, selenium and tellurium are metalloids, whereas polonium is a radioactive element. It is short lived (halflife 13.8 days). All these elements exhibit allotropy. The melting and boiling points increase with an increase in atomic number down the group. So, the option (4) is correct.
CHXI11:THE P-BLOCK ELEMENTS
316581
Why is dioxygen a gas but sulphur a solid?
1 Sulphur has strong tendency to form \({\rm{p\pi - p\pi }}\) bond
2 Due to small size oxygen has strong tendency to form \({\rm{p\pi - p\pi }}\) bond and exist as diatomic gas
3 Sulphur is larger in size hence exists as solid
4 Oxygen has less reactivity than sulphur
Explanation:
CHXI11:THE P-BLOCK ELEMENTS
316582
Assertion : \(\mathrm{F}-\mathrm{F}\) bond has low bond dissociation energy. Reason : The fluorine has lower reactivity.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
The lower bond dissociation energy in fluorine \((\mathrm{F}-\mathrm{F})\) is due to heightened interelectronic repulsions in its small-sized 2p-orbital. This makes \(\mathrm{F}-\mathrm{F}\) bond weaker compared to \(\mathrm{Cl}\) \(-\mathrm{Cl}\) and \(\mathrm{Br}-\mathrm{Br}\) bonds. Bond dissociation energies are: \({\text{F - F(38 k cal/mol),Cl - Cl(57 k cal/mol)}}\) \({\text{Br - Br (45}}{\text{.5 k cal/mol) ,}}\) and \({\text{I - I (35}}{\text{.6 k cal/mol)}}.\) \({{\text{F}}_2}\) is highly reactive non metal. So option (3) is correct.
CHXI11:THE P-BLOCK ELEMENTS
316583
Which among the following factors is the most important in making fluorine the strongest oxidizing agent?
1 Electron affinity
2 Ionization enthalpy
3 Hydration enthalpy
4 Bond dissociation energy
Explanation:
\(F_{2}\) has the most negative \(\Delta {\rm{G}}^\circ \) value which is dependent on hydration enthalpy.
316580
The physical properties of group-16 elements are I. polonium is a metal and is radioactive II. all these elements exhibit allotropy III. with increase in atomic number, the melting and boiling points increase down the group The option with correct set of properties is
1 Both I and II
2 Both II and III
3 Both I and III
4 I, II and III
Explanation:
Oxygen and sulphur are non-metals, selenium and tellurium are metalloids, whereas polonium is a radioactive element. It is short lived (halflife 13.8 days). All these elements exhibit allotropy. The melting and boiling points increase with an increase in atomic number down the group. So, the option (4) is correct.
CHXI11:THE P-BLOCK ELEMENTS
316581
Why is dioxygen a gas but sulphur a solid?
1 Sulphur has strong tendency to form \({\rm{p\pi - p\pi }}\) bond
2 Due to small size oxygen has strong tendency to form \({\rm{p\pi - p\pi }}\) bond and exist as diatomic gas
3 Sulphur is larger in size hence exists as solid
4 Oxygen has less reactivity than sulphur
Explanation:
CHXI11:THE P-BLOCK ELEMENTS
316582
Assertion : \(\mathrm{F}-\mathrm{F}\) bond has low bond dissociation energy. Reason : The fluorine has lower reactivity.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
The lower bond dissociation energy in fluorine \((\mathrm{F}-\mathrm{F})\) is due to heightened interelectronic repulsions in its small-sized 2p-orbital. This makes \(\mathrm{F}-\mathrm{F}\) bond weaker compared to \(\mathrm{Cl}\) \(-\mathrm{Cl}\) and \(\mathrm{Br}-\mathrm{Br}\) bonds. Bond dissociation energies are: \({\text{F - F(38 k cal/mol),Cl - Cl(57 k cal/mol)}}\) \({\text{Br - Br (45}}{\text{.5 k cal/mol) ,}}\) and \({\text{I - I (35}}{\text{.6 k cal/mol)}}.\) \({{\text{F}}_2}\) is highly reactive non metal. So option (3) is correct.
CHXI11:THE P-BLOCK ELEMENTS
316583
Which among the following factors is the most important in making fluorine the strongest oxidizing agent?
1 Electron affinity
2 Ionization enthalpy
3 Hydration enthalpy
4 Bond dissociation energy
Explanation:
\(F_{2}\) has the most negative \(\Delta {\rm{G}}^\circ \) value which is dependent on hydration enthalpy.
