Tag: p- block elements-ii

Questions Related to p- block elements-ii

Which f the following atoms has the highest ionisation energy ?

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

  1. F

  2. Cl

  3. Br

  4. I

Show answer
Correct Option: A
Explanation:

Halogens have little tendency to lose electron. Thus they have very high ionisation enthalpy. Due to increase in atomic size, ionisation enthalpy decreases down the group.

Which of the following is incorrect statement? 

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

  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

Show answer
Correct Option: D
Explanation:

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

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

The correct order of reactivity is:

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

  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. $\mathrm{F}>\mathrm{Cl}<\mathrm{B}\mathrm{r}<\mathrm{I}$

Show answer
Correct Option: A
Explanation:

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

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

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

  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. $\mathrm{n}\mathrm{s}^{2}\mathrm{n}\mathrm{p}^{6}$

Show answer
Correct Option: C
Explanation:

Halogens are most electronegative.


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

Option C is correct.

Generally non-metals are non-lustrous. Exception to this property is-

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

  1. Flourine

  2. Chlorine

  3. Bromine

  4. Iodine

Show answer
Correct Option: D
Explanation:

Lime water is calcium hydroxide and is a base so it turns phenolphthalein solution (an indicator) pink.

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

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

  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 $+1$

Show answer
Correct Option: C
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.

Which of the following have large electronegativity values?

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

  1. Alkali metals

  2. Alkaline Earth metals

  3. Metalloids

  4. Halogens

  5. Rare earth metals

Show answer
Correct Option: D
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.

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

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

  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

Show answer
Correct Option: A
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.

Among the following which has higher electron affinity value ?

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

  1. Fluorine

  2. Chlorine

  3. Bromine

  4. Iodine

Show answer
Correct Option: B
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.

With which of the following halogen,germanium does not form a dihalide?

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

  1. Fluorine

  2. Chlorine

  3. Bromine

  4. Iodine

Show answer
Correct Option: C
Explanation:

Germanium forms tetrahalides with all halogens except astatine and forms dihalides with all halogens except bromine and astatine.