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p-Block Elements (Group 15–18) · Question 45

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

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)

AIPMT 2012 (Prelims)

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

2

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)
3

How many bridging oxygen atoms are present in P4O10?

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

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)
5

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)
6

Among the following which is the strongest oxidising agent?

  1. Br2
  2. I2
  3. Cl2
  4. F2
AIPMT 2009
7

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
8

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
9

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
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 oxides is expected to exhibit paramagnetic behaviour?

  1. CO2
  2. SiO2
  3. SO2
  4. ClO2
AIPMT 2005

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