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AIIMS 201827 May
Exam
AIIMS
Year
2018
Date
27 May
Subject
Chemistry
Chapter
Chemical Bonding and Molecular Structure

AIIMS 2018 · 27 May · Chemistry · Chemical Bonding and Molecular Structure

Which of the following order is correct?

Which of the following order is correct?Which of the following order is correct?Which of the following order is correct?

Options

  1. AAlCl3<MgCl2<NaCl\mathrm{AlCl}_3 < \mathrm{MgCl}_2 < \mathrm{NaCl} : Polarising power
  2. BCO>CO2>>HCO2−>CO32−:\mathrm{CO}>\mathrm{CO}_2>>\mathrm{HCO}_2^{-}>\mathrm{CO}_3^{2-}: Bond length
  3. CBeCl2<NF3<NH3\mathrm{BeCl}_2 < \mathrm{NF}_3 < \mathrm{NH}_3 : Dipole moment
  4. DH2 S>NH3>SiH4>BF3:\mathrm{H}_2 \mathrm{~S}>\mathrm{NH}_3>\mathrm{SiH}_4>\mathrm{BF}_3: Bond angle

Correct answer

C. BeCl2<NF3<NH3\mathrm{BeCl}_2 < \mathrm{NF}_3 < \mathrm{NH}_3 : Dipole moment

Step-by-step solution

(a) Polarising power of cations increases with the increasing charge. (+1)(+2)(+3)NaCl<MgCl2<AlCl3\begin{aligned} & (+1) \quad(+2) \quad(+3) \\ & \mathrm{NaCl} < \mathrm{MgCl}_2 < \mathrm{AlCl}_3 \\ & \end{aligned} (b) Bond order ∝1 Bond length \propto \frac{1}{\text{ Bond length }} Bond order = Bond order of  each C−O bond  Total no. of resonating structures =\frac{\text{ Bond order\text{ of } each } \mathrm{C}-\mathrm{O} \text{ bond }}{\text{ Total no. of resonating structures }}Which of the following order is correct?
Hence, the decreasing order of bond length is CO32−>HCO2−>CO2>CO\mathrm{CO}_3^{2-}>\mathrm{HCO}_2^{-}>\mathrm{CO}_2>\mathrm{CO}. (c) Cl⟵Be⇄Cl\mathrm{Cl} \longleftarrow \mathrm{Be} \rightleftarrows \mathrm{Cl},Which of the following order is correct?
Correct order of dipole moment : BeCl2<NF3<NH3\mathrm{BeCl}_2 < \mathrm{NF}_3 < \mathrm{NH}_3 (d) Correct order of bond angle : BF3>SiH4>NH3>H2 S120∘109∘28′107∘93.3∘\begin{aligned} & \mathrm{BF}_3>\mathrm{SiH}_4>\mathrm{NH}_3>\mathrm{H}_2 \mathrm{~S} \\ & \begin{array}{llll}120^{\circ} & 109^{\circ} 28^{\prime} & 107^{\circ} & 93.3^{\circ}\end{array} \\ & \end{aligned}
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