99 Percentile Qs Bank for JEE MainChemistryClassification of Elements and Periodicity in Properties
In which of the following arrangements, the sequence is not strictly according to the property written against it?
Options
- ACO 2 < SiO 2 < SnO 2 < PbO 2 : increasing oxidising power
- BHF < HCl < HBr < HI : increasing acid strength
- CB < C < O < N : increasing first ionisation energy
- DNH 3 < PH 3 < AsH 3 < SbH 3 : increasing basic strength
Correct answer
D. NH 3 < PH 3 < AsH 3 < SbH 3 : increasing basic strength
Step-by-step solution
Drago's Rule :- In case of NH 3 , PH 3 , - - - bond angle decrease ,NH 3 ( ≈ 107 ° ) & PH 3 ( ≈ 90 ° ) So, %s character of lp in NH 3 is less & %s charactor of lp top to bottom increase so basic charactor decrease.