MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic Chemistryp -Block Elements (group 15-18)Previous Year Questions
In which of the following arrangements, the order is not strictly according to the property written against it? (AIIMS 2018)
A.CO2 < SiO2 < SnO2 < PbO2 (oxidising power)
B.HF < HCl < HBr < Hl (acidic strength)
C.NH3 > PH3 < AsH3 < SbH3 (basic strength)✓ Correct
D.B < C < O < N (first ionization enthalpy)
Explanation
The correct decreasing order of basic strength is NH3 > PH3 > AsH3 > SbH3 P-BLOCK ELEMENTS (GROUP 15-18) 28
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