Tag: group 17 elements: the halogen family

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

$I$. Under standard conditions the states of the elemental forms of the halogens are: iodine-solid, bromine-liquid, chlorine-gas, fluorine-gas.
$II$. Diatomic halogen molecules exhibit dispersion forces and increase in mass moving down through the family.

  1. Statement $I$ is true, Statement $II$ is true and is a correct explanation of the phenomena described in $I$
  2. Statement $I$ is true, Statement $II$ is false
  3. Statement $I$ is false, Statement $II$ is true
  4. Statement $I$ is false, Statement $II$ is false
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Here, Iodine, bromine, chlorine and fluorine belongs to the same group. The order of their atomic mass are: 

$I > Br > Cl > F$
These diatomic atoms are having dispersion forces between them. So, their state completely depend upon their atomic mass. 
So, correct answer is option $A$. 

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

________ exist as diatomic molecules at room temperature.

  1. Alkali metals

  2. Alkaline earth metals

  3. Noble gases

  4. Halogens
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Each halogen has 7 electrons in its outer shell. Atoms are much more stable when they have 8 electrons in their outer shell. The two halogen atoms form a covalent bond with each other to form diatomic molecules in order to complete their octet.

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 a green house gas?

  1. $CO _2$
  2. $CH _4$
  3. $O _3$
  4. $N _2X$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Greenhouse gases are gases in an atmosphere that absorbs and releases radiation This process is the cause of the greenhouse effect. The main greenhouse gases in Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. So $N _2X$ is not greenhouse gas.

Hence option $D$ 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 does not truly represent the property indicated against it?

  1. $ Br _2 < Cl _2 < F _2 $ : Oxidising power
  2. $ Br < Cl < F $ : Electronegativity
  3. $ Br < F < Cl $ : Electron affinity
  4. $ Br _2 < Cl _2 < F _2 $ : Bond energy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The correct arrangements along with properties are written against them.

$ Br _2 < Cl _2 < F _2 $ : Oxidising power

$ Br < Cl < F $ : Electronegativity

$ Br < F < Cl $ : Electron affinity

$ F _2 < Br _2 < Cl _2 $ : Bond energy

Thus,we see that the order of bond energy is incorrect in the question. The correct order is given above. 

Hence, option D is correct.
Multiple choice chemistry group 17 group 17 - physical properties physical properties of group 17 elements group 17 elements: the halogen family
In the gas phase, the colours of the halogens very remarkably :
Fluorine - Pale yellow
Chlorine - Pale greenish-yellow
Bromine - Deep red-brown
Iodine - Deep violet

As one moves from $F _2$ to $I _2$, the difference between the two energy levels:

  1. decreases and probability of transition increases

  2. increases and probability of transition increases

  3. remains unchanged and probability of transition remains unchanged

  4. depends on the temperature
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As we move down the group, repulsion decreases.Because of the difference between the two energy levels decreases and probability of transition increases and colour become more dense.

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 the only nonmetal that appears as a liquid in its elemental form under standard conditions?

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

Option $C$ is the correct answer.

Bromine or $Br$ is the only non-metal which is a liquid in its elemental form under standard conditions.
Fluorine and chlorine are gases. Whereas, iodine is solid under standard conditions.

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

Least melting point is shown by the compound-

  1. $PbCl _2$
  2. $SnCl _4$
  3. $NaCl$
  4. $AlCl _3$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

We know that greater the molecular size is; greater will be van der Waal force of attraction between then and higher will be its melting point.

Among given species since in $AlCl _3$; Al has the least size so the van der Waal force of attraction will be least and the melting point of it is lowest. But because of a molecular crystalline structure of $SnCl _4$, it has least melting point among given species.

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

Select the correct order of polymerization tendency from the following :

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

Th tendency to form pi bond increases in the order
$SiO<PO<SO<ClO$
Since the size of Cl tom is smaller compared to Si, P and S, in case of Cl, less internuclear distance results in more effective sideways overlapping.
With increase in the tendency to form  the pi bond, the tendency for polymerization decreases.
Hence, the decreasing order for the tendency for polymerization is $SiO>PO>SO>ClO$.

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

Consider occurance of the halogen family in the periodic table and choose true statements.
Statement I. Fluorine is the most active nonmetallic element in the periodic table.
Statement II. As you move down the family the state of the halogens is from a solid to a gaseous state.
Statement III. By filling the outermost d orbital, the halogen elements can be converted to ions.

  1. I and III

  2. II only

  3. I and II

  4. I only

  5. II and III
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Only statement I is the true statement. 
Statement I. Fluorine is the most active nonmetallic element in the periodic table.
Statement II. As you move down the family the state of the halogens is from a gas to a solid state.
Thus, fluorine and chlorine are gases, bromine is a liquid and iodine is a solid.
Statement III. By filling the outermost p orbital the halogen elements can be converted to ions.