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p-Block Elements (Group 15–18) · Question 44

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

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)

AIPMT 2012 (Mains)

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

2

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.
AIPMT 2012 (Prelims)
3

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

  1. CaSO4 + C
  2. Fe2(SO4)3
  3. S + H2SO4
  4. H2SO4 + PCl5
AIPMT 2012 (Prelims)
4

How many bridging oxygen atoms are present in P4O10?

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

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)
AIPMT 2010 (Mains)
6

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
AIPMT 2010 (Prelims)
7

Among the following which is the strongest oxidising agent?

  1. Br2
  2. I2
  3. Cl2
  4. F2
AIPMT 2009
8

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
AIPMT 2008
9

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
AIPMT 2007
10

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
AIPMT 2006
11

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.
AIPMT 2006

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