Tag: p- block elements-ii

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Questions Related to p- block elements-ii

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

Which of the following is incorrect statement? 

  1. Bond dissociation energy of Bromine is more than that of chlorine.

  2. The standard electrode potential of chlorine is more than that of fluorine.

  3. The percentage of chlorine in bleaching powder compound is 35-38%.

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

Bond dissociation:
$Cl _{2} > Br _{2}$
Standard electrode potential:
$F>Cl$
Bleaching powder $(Ca(ClO) _{2})$             

Percentage of $Cl = \frac{35.5\times 2}{(35.5+16)\times 2 +40}$
$=\frac{71}{143}\times 100 \simeq 50$%

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

The correct order of reactivity is:

  1. $\mathrm{F}>\mathrm{Cl}>\mathrm{B}\mathrm{r}> \mathrm{I} $
  2. $\mathrm{F}<\mathrm{Cl}<\mathrm{B}\mathrm{r}<\mathrm{I}$
  3. $\mathrm{F}<\mathrm{Cl}>\mathrm{B}\mathrm{r}>\mathrm{I}$
  4. $\mathrm{F}>\mathrm{Cl}<\mathrm{B}\mathrm{r}<\mathrm{I}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As we move down the group chemical reactivity decreases due to decrease in electronegativity

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

The outer most electronic configuration of the most electronegative element is:

  1. $\mathrm{n}\mathrm{s}^{2}\mathrm{n}\mathrm{p}^{3}$
  2. $\mathrm{n}\mathrm{s}^{2}\mathrm{n}\mathrm{p}^{4}$
  3. $\mathrm{n}\mathrm{s}^{2}\mathrm{n}\mathrm{p}^{5}$
  4. $\mathrm{n}\mathrm{s}^{2}\mathrm{n}\mathrm{p}^{6}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Halogens are most electronegative.


Therefore outer electronic configuration is $ns^{2}\ np^{5}$

Option C is correct.

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

The halogen $($Group $17$ elements$)$:

  1. have an electron configuration of a noble gas less seven electrons

  2. are highly electro positive
  3. show variable oxidation state of $-1, +1, +3, +5$ and $+7$ in their various compounds
  4. forms a volatile, covalent hydrides $HX$ in which the halogen $(X)$ shows an oxidation state of $+1$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fluorine is the most electronegative in halogen family so it has oxidation number of -1 in all its compounds but Cl,Br and I are less electronegative so these elements prepare compounds with oxidation number of +1,+3,+5 and +7.

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

Which of the following have large electronegativity values?

  1. Alkali metals

  2. Alkaline Earth metals

  3. Metalloids

  4. Halogens

  5. Rare earth metals
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Electronegativity is a chemical property that describes the tendency of the atom to attract electrons towards itself.

Halogens have 7 electrons in their valence shell.
They need only 1 electron to complete their octet.
Hence, halogens are highly electronegative.

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

Assertion: Fluorine has the highest value for electronegativity.
Reason: Fluorine has the greatest attraction for electrons.

  1. Both Assertion and Reason are true and Reason is the correct explanation of Assertion

  2. Both Assertion and Reason are true but the Reason is not the correct explanation of Assertion

  3. The Assertion is true but Reason is false

  4. The Assertion is false but the reason is true

  5. Both Assertion and Reason are false
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion. 


Fluorine has the highest electronegativity. This is because its electrons are held very strongly by the nucleus as it has a small atomic radius and high nuclear charge density.

Hence, the correct option is A.

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

Among the following which has higher electron affinity value ?

  1. Fluorine

  2. Chlorine

  3. Bromine

  4. Iodine
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Electron Affinity: decreases down the group. Since the atomic size increases down the group, electron affinity generally decreases$ ( I < Br < F < Cl)$. An electron will not be as attracted to the nucleus, resulting in a low electron affinity. However, fluorine has a lower electron affinity than chlorine.