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P-Block Elements (halogen & Noble Gases) formulas

Master P-Block Elements (halogen & Noble Gases) through 14 JEE Advanced-level formulas, systematically structured with every variable spelled out. Revise concept-wise, identify the areas where you need improvement, and focus your preparation with greater precision.

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P-Block Elements (halogen & Noble Gases), every formula

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Group 17 configuration
$n s^{2} n p^{5}$
Q1MCQGroup 17
The valence configuration of halogens is:
- A
  $ns^{2}np^{5}$
- B
  $ns^{2}np^{6}$
- C
  $ns^{2}np^{4}$
- D
  $ns^{1}$
Group 18 configuration
$n s^{2} n p^{6} (He: 1 s^{2})$
Q1MCQGroup 18
The valence configuration of noble gases (except He) is:
- A
  $ns^{2}np^{6}$
- B
  $ns^{2}np^{5}$
- C
  $ns^{2}$
- D
  $ns^{2}np^{4}$
Oxidising power of halogens
$F_{2} > C l_{2} > B r_{2} > I_{2}$
Q1MCQOxidising power
The oxidising power of the halogens is:
- A
  $F_2>Cl_2>Br_2>I_2$
- B
  $I_2>Br_2>Cl_2>F_2$
- C
  all equal
- D
  $Cl_2>F_2$
Acidic strength of HX
$H F < H C l < H B r < H I$
Q1MCQHX acidity
The acidic strength of hydrogen halides is:
- A
  $HF<HCl<HBr<HI$
- B
  $HF>HCl>HBr>HI$
- C
  all equal
- D
  $HI<HCl$
Bond dissociation (anomaly)
$C l_{2} > B r_{2} > F_{2} > I_{2}$
Q1MCQBond dissociation
The bond dissociation enthalpy order (anomalous) is:
- A
  $Cl_2>Br_2>F_2>I_2$
- B
  $F_2>Cl_2>Br_2>I_2$
- C
  $I_2>Br_2>Cl_2$
- D
  all equal
Electron affinity anomaly
$C l > F$
Q1MCQEA anomaly
The electron affinity comparison is:
- A
  $Cl>F$
- B
  $F>Cl$
- C
  $F=Cl$
- D
  $Br>Cl$
Interhalogen compounds
$e.g. C l F_{3}, I F_{7}$
Q1MCQInterhalogens
An example of an interhalogen compound is:
- A
  $ClF_3$
- B
  $Cl_2$
- C
  $HCl$
- D
  $NaCl$
Noble gas reactivity
$Xe forms compounds (XeF_{2}, XeF_{4}, XeF_{6})$
Q1MCQXe compounds
Which noble gas forms fluorides?
- A
  xenon
- B
  helium
- C
  neon
- D
  argon
XeF6 hybridisation
$s p^{3} d^{3} (distorted octahedral)$
Q1MCQXeF6
The hybridisation in $XeF_6$ is:
- A
  $sp^{3}d^{3}$
- B
  $sp^{3}d^{2}$
- C
  $sp^{3}$
- D
  $sp^{3}d$
Bleaching by chlorine
$oxidising bleaching action$
Q1MCQChlorine bleaching
Chlorine bleaches by:
- A
  oxidation
- B
  reduction
- C
  absorption
- D
  neutralisation
Colour of halogens
$F_{2} pale yellow, I_{2} violet$
Q1MCQHalogen colour
The colour of iodine vapour is:
- A
  violet
- B
  pale yellow
- C
  green
- D
  red-brown
Fluorine anomaly
$highest electronegativity, no positive oxidation state$
Q1MCQFluorine anomaly
Fluorine never shows a positive oxidation state because it is the:
- A
  most electronegative element
- B
  largest halogen
- C
  least reactive
- D
  a metal
Noble gases
$monatomic, very low reactivity$
Q1MCQNoble gases nature
Noble gases are:
- A
  monatomic and nearly inert
- B
  diatomic and reactive
- C
  metallic
- D
  strong oxidisers
Melting/boiling point trend
$increases down both groups$
Q1MCQMP/BP trend
Melting and boiling points of halogens down the group:
- A
  increase
- B
  decrease
- C
  are constant
- D
  are zero

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P-Block Elements (halogen & Noble Gases) formulas

P-Block Elements (halogen & Noble Gases), every formula

Group 17 configuration

Group 18 configuration

Oxidising power of halogens

Acidic strength of HX

Bond dissociation (anomaly)

Electron affinity anomaly

Interhalogen compounds

Noble gas reactivity

XeF6 hybridisation

Bleaching by chlorine

Colour of halogens

Fluorine anomaly

Noble gases

Melting/boiling point trend

More JEE Advanced Chemistry formula sheets

Other ways to revise this chapter

Preparing students for India’s top institutes

Join QuestPix, Today!