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p-Block Elements (Group 15–18)

AIPMT 2012 (Mains)MCQMedium📈 Topic in 38% papers+4−1
Ques. 1AIPMT 2012 (Mains)

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

  1. HF < HCl < HBr < HI : increasing acidic strength
  2. H2O < H2S < H2Se < H2Te : increasing pKa values
  3. NH3 < PH3 < AsH3 < SbH3 : increasing acidic character
  4. CO2 < SiO2 < SnO2 < PbO2 : increasing oxidising power

Answer

(2) H2O < H2S < H2Se < H2Te : increasing pKa values

Solution

(1) Down group 17, the H–X bond dissociation enthalpy decreases ⇒ acidic strength HF < HCl < HBr < HI ⇒ correct.

(2) As per NCERT, the acidic character of hydrides of group 16 increases from H2O to H2Te (H–E bond enthalpy decreases).

∵ A stronger acid has a lower pKa ⇒ pKa decreases: H2O > H2S > H2Se > H2Te

∴ The given order of increasing pKa is not correct.

(3) Down group 15, the E–H bond becomes weaker ⇒ acidic character NH3 < PH3 < AsH3 < SbH3 ⇒ correct.

(4) Down group 14, the +4 state becomes less stable (inert pair effect) ⇒ oxidising power of MO2 increases; PbO2 is a strong oxidising agent ⇒ correct.

Answer: (2)

Keep practising — p-Block Elements (Group 15–18)

Ques. 2AIPMT 2012 (Prelims)

Which of the following statements is not valid for oxoacids of phosphorus?

  1. Orthophosphoric acid is used in the manufacture of triple superphosphate.
  2. Hypophosphorous acid is a diprotic acid.
  3. All oxoacids contain tetrahedral four coordinated phosphorus.
  4. All oxoacids contain at least one P=O unit and one P-OH group.
Ques. 3AIPMT 2012 (Prelims)

Sulphur trioxide can be obtained by which of the following reactions?

  1. CaSO4 + C
  2. Fe2(SO4)3
  3. S + H2SO4
  4. H2SO4 + PCl5
Ques. 4AIPMT 2010 (Mains)

How many bridging oxygen atoms are present in P4O10?

  1. 6
  2. 4
  3. 2
  4. 5
Ques. 5AIPMT 2010 (Mains)

Match List-I (substances) with List-II (processes) employed in the manufacture of the substances and select the correct option.

  1. (A) (i); (B) (iv); (C) (ii); (D) (iii)
  2. (A) (i); (B) (ii); (C) (iii); (D) (iv)
  3. (A) (iv); (B) (iii); (C) (ii); (D) (i)
  4. (A) (iv); (B) (ii); (C) (iii); (D) (i)
Ques. 6AIPMT 2010 (Prelims)

Oxidation states of P in H4P2O5, H4P2O6, H4P2O7 are respectively

  1. +3, +5, +4
  2. +5, +3, +4
  3. +5, +4, +3
  4. +3, +4, +5
Ques. 7AIPMT 2009

Among the following which is the strongest oxidising agent?

  1. Br2
  2. I2
  3. Cl2
  4. F2
Ques. 8AIPMT 2008

Which of the following arrangements do not give the correct picture of the trends indicated against them?

  1. F2 > Cl2 > Br2 > I2 : Bond dissociation energy
  2. F2 > Cl2 > Br2 > I2 : Electronegativity
  3. F2 > Cl2 > Br2 > I2 : Oxidizing power
  4. F2 > Cl2 > Br2 > I2 : Electron gain enthalpy
Ques. 9AIPMT 2007

Which one of the following orders correctly represents the increasing acid strengths of the given acids?

  1. HOClO < HOCl < HOClO3 < HOClO2
  2. HOClO2 < HOClO3 < HOClO < HOCl
  3. HOClO3 < HOClO2 < HOClO < HOCl
  4. HOCl < HOClO < HOClO2 < HOClO3
Ques. 10AIPMT 2006

Which one of the following orders is not in accordance with the property stated against it ?

  1. F2 > Cl2 > Br2 > I2 : Bond dissociation energy
  2. F2 > Cl2 > Br2 > I2 : Oxidising power
  3. HI > HBr > HCl > HF : Acidic property in water
  4. F2 > Cl2 > Br2 > I2 : Electronegativity
Ques. 11AIPMT 2006

Which one of the following orders is not in accordance with the property stated against it?

  1. F2 > Cl2 > Br2 > I2 : Bond dissociation energy
  2. F2 > Cl2 > Br2 > I2 : Oxidising power
  3. HI > HBr > HCl > HF : Acidic property in water
  4. F2 > Cl2 > Br2 > I2 : Electronegativity.

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