Tag: physical properties of group 17 elements

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Questions Related to physical properties of group 17 elements

Multiple choice chemistry group 17 group 17 - physical properties physical properties of group 17 elements group 17 elements: the halogen family

The electron affinity values (in kJ $mol^{-1}$) of three halogens X, Y and Z are respectively$ -349, -333 $and $-325$.


 X, Y, and Z respectively are :

  1. $F _2, Cl _2, Br2$
  2. $Cl _2, F _2$ and $Br _2$
  3. $Cl _2, Br _2, F _2$
  4. $Br _2, Cl _2$ and $F _2$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

According to the values electron affinity the  three halogens X, Y and Z are $Cl _2$,$F _2$ and $Br _2$

Hence option B is correct

Multiple choice chemistry group 17 group 17 - physical properties physical properties of group 17 elements group 17 elements: the halogen family

Which of the following possesses the highest bond energy?

  1. $F _2$
  2. $Cl _2$
  3. $Br _2$
  4. $I _2$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$F _2$ is a smaller molecule than $Cl _2$. This means that the bonded electrons in $F _2$ are closer to the outer shell unbonded electrons. Due to the electron repulsion theory, the bonded electrons repel the outer shell unbonded electrons far more in $F _2$ than they would in $Cl _2$. 


since  $Cl _2$ has more shells so more shielding of the outer electrons. The fact that the bonded electrons in $F _2$ repel the unbonded electrons so much makes the molecule weak, so it is easier to break. 


Hence option B is correect.

Multiple choice chemistry group 17 group 17 - physical properties physical properties of group 17 elements group 17 elements: the halogen family

Which of the following is incorrect?

  1. Among $Cl, Ar $ and $ K$, $K$ has the smallest ionization potential.
  2. Among $CH _4,\, NH _3,$ and $ HF$,$ HF$ has the highest boiling point.
  3. Among $Cl _2,\, Br _2,\, and\, l _2,\, Br _2$ has the lowest boiling point.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
K is a metal and has 1 valence electron, which can be removed easily to attain nearest noble gas configuration. Hence, it has the lowest Ionization energy. 

Argon is already stable and has 8 electrons in it's outermost shell. Cl needs one more electron as it has 7 valence electrons. It is very difficult to remove an electron form Cl due to high electronegativity.

HF has the highest boiling point compared to methane and ammonia due to the strong hydrogen bonding.

Chlorine is a gas, bromine is a liquid and iodine is a solid at room temperature. As the atomic number increases, atomic size increases and due to the increase in surface area, the boiling point increases. Hence, chlorine has lowest boiling point.

Hence, option C is correct.
Multiple choice chemistry group 17 group 17 - physical properties physical properties of group 17 elements group 17 elements: the halogen family

Select the correct increasing order of $\pi$ bond formation tendency from the following :

  1. $Si\, -\, O\, >\, P\, -\, O\, >\, S\, -\, O\, >\, Cl\, -\, O$
  2. $Si\, -\, O\, <\, P\, -\, O\, <\, S\, -\, O\, <\, Cl\, -\, O$
  3. $Cl\, -\, O\, <\, Si\, -\, O\, <\, P\, -\, O\, <\, S\, -\, O$
  4. $Si\, -\, O\, <\, Cl\, -\, O\, <\, P\, -\, O\, <\, S\, -\, O$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The correct increasing order of the pi bonding tendency is $Si\, -\, O\, <\, P\, -\, O\, <\, S\, -\, O\, <\, Cl\, -\, O$.
This is because, with decrease in the size from Si to Cl, the effectiveness of the sideways overlap increases.

Multiple choice chemistry group 17 group 17 - physical properties physical properties of group 17 elements group 17 elements: the halogen family

Match the following
Set- I                              Set - II
A) $F _{2}$               1) pale yellow colour gas
B)$Cl _{2}$               2) violet colour solid
C)$Br _{2}$              3) orange liquid
D)$I _{2}$                 4) greenish colour gas
Correct the matching is

  1. A-1, B-3, C-2, D-4

  2. A-1, B-4, C-3, D-2

  3. A-2, B-3, C-4, D-1

  4. A-3, B-2, C-1, D-4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$F _{2}$ - pale yellow colour gas

$Cl _{2}$ - greenish colour gas

$Br _{2}$ - orange liquid

$I _{2}$ - Violet colour solid

A) 1

B) 4

C) 3

D) 2

Multiple choice chemistry group 17 group 17 - physical properties physical properties of group 17 elements group 17 elements: the halogen family

The colour of iodine is:

  1. violet

  2. green

  3. white

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

Iodine has atomic number 53 belonging to group 17. The name is from Greek meaning violet or purple due to the colour of elemental iodine vapour. It is a bluish-black solid with a metallic lustre sublimating into violet-pink gas and colour is due to absorption of visible light by an electronic transition between highest and lowest molecular orbitals.

Multiple choice chemistry group 17 group 17 - physical properties physical properties of group 17 elements group 17 elements: the halogen family

Which of the following is not the characteristic of interhalogen compounds?

  1. They are covalent

  2. More reactive than halogens

  3. Have low B.P. and high volatile

  4. Quite unstable but not explosive
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Interhalogen compounds are covalent in nature. More reactive than halogens because of low bond energy due to dissimilar size of atoms in molecule. As the molecule becomes a little polar the boiling point increases due to inter-molecular attraction. They are reactive and unstable because of low bond energy.