Given below are two statements:
Statement - I: Noble gases have very high boiling points.
Statement -II: Noble gases are monoatomic gases. They are held together by strong dispersion forces. Because of this they are liquefied at very low temperature. Hence, they have very high boiling points.
In the light of the above statements, choose the correct answer from the options given below: [2024]
Statement I is false but Statement II is true.
Both Statement I and Statement II are true.
Statement I is true but Statement II is false.
Both Statement I and Statement II are false.
(D)
Gases which have strong intermolecular attractive forces are easy to liquefy. Noble gases are monoatomic hence non polar. As a result, intermolecular forces for noble gases are weak London dispersion forces. Hence these are difficult to liquefy and have low boiling point.
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): and molecule have pyramidal shape with a lone pair of electrons on nitrogen atom. The resultant dipole moment of is greater than that of .
Reason (R): In , the orbital dipole due to lone pair is in the same direction as the resultant dipole moment of the N-H bonds. F is the most electronegative element.
In the light of the above statements, choose the correct answer from the options given below: [2024]
(A) is true but (R) is false
Both (A) and (R) are true but (R) is NOT the correct explanation of (A)
(A) is false but (R) is true
Both (A) and (R) are true and (R) is the correct explanation of (A)
(D)
In , lone pair moment and bond pair moment are in same direction whereas in , lone pair moment and bond pair moment are in opposite direction. Hence dipole of is greater than in .
