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p-Block Elements (Group 15–18) · Question 42

NEET 2013MCQEasy📈 Topic in 38% papers+4−1
1

Roasting of sulphides gives the gas X as a byproduct. This is a colourless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as a reducing agent and its acid has never been isolated. The gas X is

  1. CO2
  2. SO3
  3. H2S
  4. SO2

Answer

(4) SO2

Solution

Roasting of sulphide ores gives SO2:

2ZnS + 3O2 2ZnO + 2SO2

As per NCERT, sulphur dioxide is a colourless gas with pungent smell; it dissolves in water to give sulphurous acid, which is known only in solution (never isolated):

SO2(g) + H2O(l) H2SO3(aq)

Moist SO2 behaves as a reducing agent (e.g. it decolourises acidified KMnO4).

X is SO2.

Answer: (4)

Out of syllabusNEET 2013

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

2

Identify the incorrect statement, regarding the molecule XeO4:

  1. XeO4 molecule is square planar.
  2. There are four p -d bonds.
  3. There are four sp3-p, bonds.
  4. XeO4 molecule is tetrahedral.
NEET 2013 (Karnataka)
3

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
AIPMT 2012 (Mains)
4

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)
5

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)
6

How many bridging oxygen atoms are present in P4O10?

  1. 6
  2. 4
  3. 2
  4. 5
AIPMT 2010 (Mains)
7

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)
8

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)
9

Among the following which is the strongest oxidising agent?

  1. Br2
  2. I2
  3. Cl2
  4. F2
AIPMT 2009
10

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
11

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

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