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p-Block Elements (Group 15–18)

AIPMT 2012 (Prelims)MCQEasy📈 Topic in 50% papers+4−1
Ques. 1AIPMT 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.

Answer

(2) Hypophosphorous acid is a diprotic acid.

Solution

As per NCERT, in oxoacids of phosphorus, P is tetrahedrally surrounded by other atoms, every acid has at least one P=O and one P–OH bond, and only the H atoms attached to O (P–OH) are ionisable.

Hypophosphorous acid, H3PO2, has two P–H bonds and only one P–OH group.

it is monobasic (monoprotic), not diprotic.

statement (2) is not valid; (1) is valid since H3PO4 converts phosphate rock into triple superphosphate.

Answer: (2)

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

Ques. 2AIPMT 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. 3AIPMT 2010 (Mains)

How many bridging oxygen atoms are present in P4O10?

  1. 6
  2. 4
  3. 2
  4. 5
Ques. 4AIPMT 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. 5AIPMT 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. 6AIPMT 2009

Among the following which is the strongest oxidising agent?

  1. Br2
  2. I2
  3. Cl2
  4. F2
Ques. 7AIPMT 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. 8AIPMT 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. 9AIPMT 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. 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 2005

Which one of the following oxides is expected to exhibit paramagnetic behaviour?

  1. CO2
  2. SiO2
  3. SO2
  4. ClO2

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