Acidic strength of oxyacids decreases down the group.
CHXI11:THE P-BLOCK ELEMENTS
316227
Assertion : Among nitrogen halides \(\mathrm{NX}_{3}\), the dipole moment is highest for \(\mathrm{NI}_{3}\) and lowest for \(\mathrm{NF}_{3}\). Reason : Nitrogen halides \(\mathrm{NX}_{3}\), have trigonal pyramidal structure.
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:
\(\mathrm{NI}_{3}\) has highest dipole moment due to the higher electronegativity of \(\mathrm{N}\) than \(\mathrm{I}\) atom. In \(\mathrm{NF}_{3}\), the dipole moments due to lone pair and \(\mathrm{N}-\mathrm{F}\) bonds is partially cancelled, as \(\mathrm{F}\) is more electronegative than \(\mathrm{N}\). All \(\mathrm{NX}_{3}\) have pyramidal shape as the nitrogen atom undergoes \(\mathrm{sp}^{3}\) hybridisation with a lone pair. So option (2) is correct.
CHXI11:THE P-BLOCK ELEMENTS
316228
In solid state, \(\mathrm{PCl}_5\) is \(\mathrm{a} / \mathrm{an}\)
Solid \(\mathrm{PCl}_5\) exists as \(\mathrm{PCl}_4^{+}\)and \(\mathrm{PCl}_6^{-}\)
KCET - 2023
CHXI11:THE P-BLOCK ELEMENTS
316229
\(\mathrm{PCl}_{5}\) is well known but, \(\mathrm{NCl}_{5}\) is not because
1 nitrogen is less reactive than phosphorous.
2 nitrogen doesn't have d - orbitals in its valence shell.
3 catenation tendency is weaker in nitrogen than phosphorous.
4 size of phosphorous is larger than nitrogen.
Explanation:
\(\mathrm{PCl}_{5}\) forms five bonds by using the \(\mathrm{d}\) - orbitals to " expand the octet". But \(\mathrm{NCl}_{5}\) does not exist because there are no \(\mathrm{d}\) - orbitals in the valence shell \(\left( {{{\rm{2}}^{{\rm{nd }}}}\,\,{\rm{shell}}} \right)\). Therefore there is no way to expand the octet.
Acidic strength of oxyacids decreases down the group.
CHXI11:THE P-BLOCK ELEMENTS
316227
Assertion : Among nitrogen halides \(\mathrm{NX}_{3}\), the dipole moment is highest for \(\mathrm{NI}_{3}\) and lowest for \(\mathrm{NF}_{3}\). Reason : Nitrogen halides \(\mathrm{NX}_{3}\), have trigonal pyramidal structure.
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:
\(\mathrm{NI}_{3}\) has highest dipole moment due to the higher electronegativity of \(\mathrm{N}\) than \(\mathrm{I}\) atom. In \(\mathrm{NF}_{3}\), the dipole moments due to lone pair and \(\mathrm{N}-\mathrm{F}\) bonds is partially cancelled, as \(\mathrm{F}\) is more electronegative than \(\mathrm{N}\). All \(\mathrm{NX}_{3}\) have pyramidal shape as the nitrogen atom undergoes \(\mathrm{sp}^{3}\) hybridisation with a lone pair. So option (2) is correct.
CHXI11:THE P-BLOCK ELEMENTS
316228
In solid state, \(\mathrm{PCl}_5\) is \(\mathrm{a} / \mathrm{an}\)
Solid \(\mathrm{PCl}_5\) exists as \(\mathrm{PCl}_4^{+}\)and \(\mathrm{PCl}_6^{-}\)
KCET - 2023
CHXI11:THE P-BLOCK ELEMENTS
316229
\(\mathrm{PCl}_{5}\) is well known but, \(\mathrm{NCl}_{5}\) is not because
1 nitrogen is less reactive than phosphorous.
2 nitrogen doesn't have d - orbitals in its valence shell.
3 catenation tendency is weaker in nitrogen than phosphorous.
4 size of phosphorous is larger than nitrogen.
Explanation:
\(\mathrm{PCl}_{5}\) forms five bonds by using the \(\mathrm{d}\) - orbitals to " expand the octet". But \(\mathrm{NCl}_{5}\) does not exist because there are no \(\mathrm{d}\) - orbitals in the valence shell \(\left( {{{\rm{2}}^{{\rm{nd }}}}\,\,{\rm{shell}}} \right)\). Therefore there is no way to expand the octet.
Acidic strength of oxyacids decreases down the group.
CHXI11:THE P-BLOCK ELEMENTS
316227
Assertion : Among nitrogen halides \(\mathrm{NX}_{3}\), the dipole moment is highest for \(\mathrm{NI}_{3}\) and lowest for \(\mathrm{NF}_{3}\). Reason : Nitrogen halides \(\mathrm{NX}_{3}\), have trigonal pyramidal structure.
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:
\(\mathrm{NI}_{3}\) has highest dipole moment due to the higher electronegativity of \(\mathrm{N}\) than \(\mathrm{I}\) atom. In \(\mathrm{NF}_{3}\), the dipole moments due to lone pair and \(\mathrm{N}-\mathrm{F}\) bonds is partially cancelled, as \(\mathrm{F}\) is more electronegative than \(\mathrm{N}\). All \(\mathrm{NX}_{3}\) have pyramidal shape as the nitrogen atom undergoes \(\mathrm{sp}^{3}\) hybridisation with a lone pair. So option (2) is correct.
CHXI11:THE P-BLOCK ELEMENTS
316228
In solid state, \(\mathrm{PCl}_5\) is \(\mathrm{a} / \mathrm{an}\)
Solid \(\mathrm{PCl}_5\) exists as \(\mathrm{PCl}_4^{+}\)and \(\mathrm{PCl}_6^{-}\)
KCET - 2023
CHXI11:THE P-BLOCK ELEMENTS
316229
\(\mathrm{PCl}_{5}\) is well known but, \(\mathrm{NCl}_{5}\) is not because
1 nitrogen is less reactive than phosphorous.
2 nitrogen doesn't have d - orbitals in its valence shell.
3 catenation tendency is weaker in nitrogen than phosphorous.
4 size of phosphorous is larger than nitrogen.
Explanation:
\(\mathrm{PCl}_{5}\) forms five bonds by using the \(\mathrm{d}\) - orbitals to " expand the octet". But \(\mathrm{NCl}_{5}\) does not exist because there are no \(\mathrm{d}\) - orbitals in the valence shell \(\left( {{{\rm{2}}^{{\rm{nd }}}}\,\,{\rm{shell}}} \right)\). Therefore there is no way to expand the octet.
Acidic strength of oxyacids decreases down the group.
CHXI11:THE P-BLOCK ELEMENTS
316227
Assertion : Among nitrogen halides \(\mathrm{NX}_{3}\), the dipole moment is highest for \(\mathrm{NI}_{3}\) and lowest for \(\mathrm{NF}_{3}\). Reason : Nitrogen halides \(\mathrm{NX}_{3}\), have trigonal pyramidal structure.
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:
\(\mathrm{NI}_{3}\) has highest dipole moment due to the higher electronegativity of \(\mathrm{N}\) than \(\mathrm{I}\) atom. In \(\mathrm{NF}_{3}\), the dipole moments due to lone pair and \(\mathrm{N}-\mathrm{F}\) bonds is partially cancelled, as \(\mathrm{F}\) is more electronegative than \(\mathrm{N}\). All \(\mathrm{NX}_{3}\) have pyramidal shape as the nitrogen atom undergoes \(\mathrm{sp}^{3}\) hybridisation with a lone pair. So option (2) is correct.
CHXI11:THE P-BLOCK ELEMENTS
316228
In solid state, \(\mathrm{PCl}_5\) is \(\mathrm{a} / \mathrm{an}\)
Solid \(\mathrm{PCl}_5\) exists as \(\mathrm{PCl}_4^{+}\)and \(\mathrm{PCl}_6^{-}\)
KCET - 2023
CHXI11:THE P-BLOCK ELEMENTS
316229
\(\mathrm{PCl}_{5}\) is well known but, \(\mathrm{NCl}_{5}\) is not because
1 nitrogen is less reactive than phosphorous.
2 nitrogen doesn't have d - orbitals in its valence shell.
3 catenation tendency is weaker in nitrogen than phosphorous.
4 size of phosphorous is larger than nitrogen.
Explanation:
\(\mathrm{PCl}_{5}\) forms five bonds by using the \(\mathrm{d}\) - orbitals to " expand the octet". But \(\mathrm{NCl}_{5}\) does not exist because there are no \(\mathrm{d}\) - orbitals in the valence shell \(\left( {{{\rm{2}}^{{\rm{nd }}}}\,\,{\rm{shell}}} \right)\). Therefore there is no way to expand the octet.
