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p-Block Elements (Group 15–18) · Question 37

AIPMT 2015MCQEasy📈 Topic in 50% papers+4−1
1

The variation of the boiling points of the hydrogen halides is in the order HF > HI > HBr > HCl. What explains the higher boiling point of hydrogen fluoride?

  1. There is strong hydrogen bonding between HF molecules.
  2. The bond energy of HF molecules is greater than in other hydrogen halides.
  3. The effect of nuclear shielding is much reduced in fluorine which polarises the HF molecule.
  4. The electronegativity of fluorine is much higher than for other elements in the group.

Answer

(1) There is strong hydrogen bonding between HF molecules.

Solution

Boiling point depends on intermolecular forces, not on the strength of the covalent bond within the molecule.

∵ Fluorine is small and highly electronegative, HF molecules are associated through strong intermolecular hydrogen bonds (H-F H-F).

⇒ Extra energy is needed to separate them, so HF has the highest boiling point; for HCl, HBr, HI the boiling point rises with van der Waals forces (size).

Answer: (1)

AIPMT 2015

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

2

Which of the statements given below is incorrect?

  1. O3 molecule is bent.
  2. ONF is isoelectronic with O2N-
  3. OF2 is an oxide of fluorine.
  4. Cl2O7 is an anhydride of perchloric acid.
AIPMT 2015
3

Nitrogen dioxide and sulphur dioxide have some properties in common. Which property is shown by one of these compounds, but not by the other?

  1. Is soluble in water.
  2. Is used as a food preservative.
  3. Forms 'acid-rain'.
  4. Is a reducing agent.
AIPMT 2015 (Cancelled)
4

Acidity of diprotic acids in aqueous solutions increases in the order

  1. H2S < H2Se < H2Te
  2. H2Se < H2S < H2Te
  3. H2Te < H2S < H2Se
  4. H2Se < H2Te < H2S
AIPMT 2014
5

Which is the strongest acid in the following?

  1. HClO4
  2. H2SO3
  3. H2SO4
  4. HClO3
NEET 2013
6

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
Out of syllabusNEET 2013
7

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)
8

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)
9

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)
10

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)
11

How many bridging oxygen atoms are present in P4O10?

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

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