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p-Block Elements (Group 15–18) · Question 51

AIPMT 2008Multiple CorrectMedium📈 Topic in 50% papers+4−1
1

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

Answer

(1) F2 > Cl2 > Br2 > I2 : Bond dissociation energy, (4) F2 > Cl2 > Br2 > I2 : Electron gain enthalpy

Solution

(1) Bond dissociation enthalpy ( kJ mol-1): Cl2 (242.6) > Br2 (192.8) > F2 (158.8) > I2 (151.1).

∵ As per NCERT, the bond dissociation enthalpy of F2 is smaller than that of Cl2 due to large electron–electron repulsion among the lone pairs of the small F atoms.

⇒ The given order is incorrect.

(2) Electronegativity decreases down the group: F > Cl > Br > I ⇒ correct.

(3) Oxidising power: F2 > Cl2 > Br2 > I2 ⇒ correct.

(4) Negative electron gain enthalpy ( kJ mol-1): Cl (–349) > F (–333) > Br (–325) > I (–296).

∵ As per NCERT, F has a less negative electron gain enthalpy than Cl because of its small size (strong interelectronic repulsion in the compact 2p subshell).

⇒ The given order is incorrect.

∴ Arrangements (1) and (4) are incorrect.

Answer: (1), (4)

AIPMT 2008

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

2

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
3

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
4

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
5

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

  1. CO2
  2. SiO2
  3. SO2
  4. ClO2
AIPMT 2005
6

What is the correct relationship between the pH of isomolar solutions of sodium oxide, Na2O (pH1), sodium sulphide, Na2S (pH2), sodium selenide, Na2Se (pH3) and sodium telluride Na2Te (pH4)?

  1. pH1 > pH2 > pH3 > pH4
  2. pH1 > pH2 pH3 > pH4
  3. pH1 < pH2 < pH3 < pH4
  4. pH1 < pH2 < pH3 pH4
AIPMT 2005
7

Which one of the following orders correctly represents the increasing acid strengths of the given acids?

  1. HOClO < HOCl < HOClO3 < HOClO2
  2. HOClO3 < HOClO2 < HOClO < HOCl
  3. HOClO2 < HOClO3 < HOClO < HOCl
  4. HOCl < HOClO < HOClO2 < HOClO3
AIPMT 2005
8

Which one of the following statements is not true?

  1. Among halide ions, iodide is the most powerful reducing agent.
  2. Fluorine is the only halogen that does not show a variable oxidation state.
  3. HOCl is a stronger acid than HOBr.
  4. HF is a stronger acid than HCl.
AIPMT 2003
9

Which of the following statement is true?

  1. Silicon exhibits 4 coordination number in its compounds
  2. Bond energy of F2 is less than Cl2
  3. Mn(III) oxidation state is more stable than Mn(II) in aqueous state
  4. Elements of 15th group show only +3 and +5 oxidation states
AIPMT 2002
10

Zn gives H2 gas with H2SO4 and HCl but not with HNO3 because

  1. Zn acts as oxidising agent when it reacts with HNO3
  2. HNO3 is weaker acid than H2SO4 and HCl
  3. In electrochemical series Zn is above hydrogen
  4. NO3- is reduced in preference to hydronium ion.
AIPMT 2002
11

Nitrogen forms N2, but phosphorus does not form P2, however, it exists as P4, reason is

  1. triple bond present between phosphorus atoms
  2. p - p bonding is weak
  3. p - p bonding is strong
  4. multiple bonds form easily.
AIPMT 2001

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