Tag: group 17 elements - general properties

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Multiple choice chemistry p- block elements-ii group 17 elements - general properties group 17 elements group 17 elements - properties

In NaOX , X cannot be

  1. ${ F } _{ 2 }$
  2. ${ Cl } _{ 2 }$
  3. ${ Br } _{ 2 }$
  4. $I _{ 2 }$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In NaOX, X represents a halogen. While NaOF, NaClO, and NaBrO are known compounds, NaOI is extremely unstable and does not exist in standard conditions because iodine is not electronegative enough to form a stable hypohalite ion in this context.

Multiple choice chemistry p- block elements-ii group 17 elements - general properties group 17 elements group 17 elements - properties

The table shows some information about elements in Group VII of the Periodic Table. 

Name State at room temperature Colour
Chlorine Gas yellow-green
Bromine liquid brown
iodine ? ?
Astaine solid black

Which information about iodine completes the table?

  1. State - liquid, colour - black

  2. State - liquid, colour - green

  3. State - solid, colour - grey

  4. State - solid, colour - yellow
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
$\text{D) State-solid,Colour-yellow}$
$\text{Iodine is solid at room temperature and appears yellow in low concentrat}$
Multiple choice chemistry p- block elements-ii group 17 elements - general properties group 17 elements group 17 elements - properties

Which requires the highest energy for excitation?

  1. F

  2. Cl

  3. Br

  4. I
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fluorine has a small size thus it has a high nuclear charge and its electrons are strongly attracted towards the nucleus. Thus it requires high energy for excitation. Among halogen atoms, fluorine requires the highest energy for excitation.

Multiple choice chemistry p- block elements-ii group 17 elements - general properties group 17 elements group 17 elements - properties

Which of the following statement is wrong? In the reaction $2KCl{ O } _{ 3 }+{ I } _{ 2 }\rightarrow 2KI{ O } _{ 3 }+{ Cl } _{ 2 }$?

  1. ${ Cl } _{ 2 }$ is more reactive than $I _{ 2 }$
  2. When $KCl{ O } _{ 3 }$ reacts with $I _{ 2 }$, ${ Cl } _{ 2 }$ is liberated
  3. $KCl{ O } _{ 3 }+{ I } _{ 2 }$ is a redox reaction and $I _{ 2 }$ is oxidized
  4. In the above reaction, $I _{ 2 }$ is reduced
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

the given reaction is

${ 2KClO } _{ 3 }+{ I } _{ 2 }\rightarrow { 2KIO } _{ 3 }+{ Cl } _{ 2 }$
in reactant,oxidation state of iodine in ${ I } _{ 2 }=0$
in product,oxidation state of iodine in${ IO } _{ 3 }^{ - }\quad $is 3
so,oxidation state of iodine change from 0 to5,so it is oxidlsed.

Multiple choice chemistry p- block elements-ii group 17 elements - general properties group 17 elements group 17 elements - properties

For electron affinity of halogens which of the following is correct?

  1. $Br>F$
  2. $F>Cl$
  3. $Br>Cl$
  4. $F>I$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • Electron Gain Enthalpy is the energy released when one mole of an electron is added to gaseous atoms of an element. 
  • The correct order of Electron gain enthalpy of Fluorine family is,
$Cl>F>Br>I$
The reason for this is that the size of the fluorine atom is very small. So when an electron is added in the fluorine atom it will suffer more electronegativity as all the electrons will be very close to each other and hence the electron gain enthalpy of chlorine is more negative than that of fluorine.

Multiple choice chemistry p- block elements-ii group 17 elements - general properties group 17 elements group 17 elements - properties

Chlorine has two naturally occuring isotopes $ _{ 17 }^{ 37 }{ Cl }$ and $ _{ 17 }^{ 35 }{ Cl }$ and average atomic mass of chlorine is $35.5$. The percentage of $ _{ 17 }^{ 37 }{ Cl }$ is:

  1. 25%

  2. 75%

  3. 40%

  4. 60%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Let x be the percentage of Cl-37. Then (100-x) is the percentage of Cl-35. The average atomic mass is (37x + 35(100-x))/100 = 35.5. Solving this gives 37x + 3500 - 35x = 3550, so 2x = 50, x = 25%.