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JEE Main 20127 MayOnline
Exam
JEE Main
Year
2012
Date
7 May
Mode
Online
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

JEE Main 2012 · 7 May · Online · Chemistry · Classification of Elements and Periodicity in Properties

In which of the following arrangements, the sequence is not...

In which of the following arrangements, the sequence is not strictly according to the property written against it?

Options

  1. ACO2<SiO2<SnO2<PbO2\mathrm{CO}_2 < \mathrm{SiO}_2 < \mathrm{SnO}_2 < \mathrm{PbO}_2 : increasing oxidising power
  2. BNH3<PH3<AsH3<SbH3\mathrm{NH}_3 < \mathrm{PH}_3 < \mathrm{AsH}_3 < \mathrm{SbH}_3 : increasing basic strength
  3. CHF<HCl<HBr<HI\mathrm{HF} < \mathrm{HCl} < \mathrm{HBr} < \mathrm{HI} : increasing acid strength
  4. DB<C<O<N\mathrm{B} < \mathrm{C} < \mathrm{O} < \mathrm{N} : increasing first ionisation enthalpy.

Correct answer

B. NH3<PH3<AsH3<SbH3\mathrm{NH}_3 < \mathrm{PH}_3 < \mathrm{AsH}_3 < \mathrm{SbH}_3 : increasing basic strength

Step-by-step solution

Correct order of increasing basic strength is NH3>PH3>AsH3>SbH3>BiH3\mathrm{NH}_3>\mathrm{PH}_3>\mathrm{AsH}_3>\mathrm{SbH}_3>\mathrm{BiH}_3
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