Tag: p-block elements

Quizzes (27) Questions (202)

Questions Related to p-block elements

Multiple choice oxoacids of halogens p- block elements-ii p-block elements the p-block elements chemistry

Which one of the following oxy acid of fluorine exists ?

  1. $HOF$
  2. $HFO _{3}$
  3. $HFO _{4}$
  4. $HFO _{2}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In fluorine d-orbitals are absent so it shows only +1 oxidation state in oxo-acid,
but not + 3, + 5 or + 7. 


That's why unlike other members (halogens) fluorine only forms one oxoacid HOF.

Hence, option A is correct.

Multiple choice oxoacids of halogens p- block elements-ii p-block elements the p-block elements chemistry

Among the oxyacids of chlorine, the strongest oxidising agent is:

  1. $\mathrm{H}\mathrm{Cl}\mathrm{O} _{4}$
  2. $\mathrm{H}\mathrm{Cl}\mathrm{O} _{3}$
  3. $\mathrm{H}\mathrm{Cl}\mathrm{O} _{2}$
  4. $\mathrm{HCl}\mathrm{O}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$H\overset{+7}{Cl}O _4$ is strongest oxidising agent.
as Cl is in its highest oxidation state, i.e., +7.
Oxidation state $\alpha$ Oxdising nature 

Multiple choice oxoacids of halogens p- block elements-ii p-block elements the p-block elements chemistry

Which one of the following oxyacids of chlorine is the least oxidizing in nature?

  1. $\mathrm{HOCl}$
  2. $\mathrm{H}\mathrm{Cl}\mathrm{O} _{2}$
  3. $\mathrm{H}\mathrm{Cl}\mathrm{O} _{4}$
  4. $\mathrm{H}\mathrm{Cl}\mathrm{O} _{3}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$\overset{+7}{HClO _{4}}$ a is in highest oxidation state so its oxidizing nature is least.

oxidation state $\alpha$ $\frac{1}{oxidising \ nature}$


Option C is correct.

Multiple choice oxoacids of halogens p- block elements-ii p-block elements the p-block elements chemistry

Which of the following statements is not correct?

  1. All halogens except flourine from OXO-acids

  2. Hypohalous acids HOCI,HOBr and HOI are all strong acids

  3. Hypochlorous acid is the most stable among hypohalous acids

  4. Chlorous acid is the only halous acid known
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

There are also other halous acids like:
$HOBr _2$ which is Hydrobromous acid.
So D is wrong

Multiple choice oxoacids of halogens p- block elements-ii p-block elements the p-block elements chemistry

Which of the following forms are the most basic in 0.1 M solution?

  1. $\mathrm{NaCl}$
  2. $\mathrm{NaOCl}$
  3. $\mathrm{N}\mathrm{a}\mathrm{C}\mathrm{l}\mathrm{O} _{2}$
  4. $\mathrm{N}\mathrm{a}\mathrm{C}\mathrm{l}\mathrm{O} _{3}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$NaCl^{-1}$
$NaOCl^{+1}$ - most basic as Cl is in +1 oxidation state and on hydrolysis it gives weak acid HOCl. Thus it is most basic among the given compounds.
$\overset{+3}{NaClO _{2}}$
$\overset{+5}{NaClO _{3}}$

Multiple choice oxoacids of halogens p- block elements-ii p-block elements the p-block elements chemistry

The increasing order of the acidity of the following acids is:


 l) $H _{2}SO _{3}$
ll) $H _{3}PO _{3}$ 
lll) HClO$ _{3}$

  1. l>lll>ll

  2. l > ll > lll

  3. lll>l >lI

  4. ll>lll>l
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Here as the non-metallic nature of the central atom increases, its acidity increases in its oxyacids Thus, increasing order of acidity will be:
III > I >II
Multiple choice oxoacids of halogens p- block elements-ii p-block elements the p-block elements chemistry

Match the following


Set-l (Cl-O bond length)       Set -ll($\mathrm{A}^{0})$
$\mathrm{A}) H\mathrm{C}lO$                                 1)$ 1.64$
$\mathrm{B}) HClO _{2}$                               2$) 1.70$
$\mathrm{C}) HClO _{3}$                               3$)$ 1.45
$\mathrm{D}) HClO _{4}$                               4$) 1.57$

The correct matching is:

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

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

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

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

Bond order $\propto \ \frac{1}{Bond\ length}$


Bond order of $HClO _4 > HClO _3 > HClO _2> HClO$

Bond length
$HClO > HClO _2 > HClO _3 > HClO _4$

Multiple choice oxoacids of halogens p- block elements-ii p-block elements the p-block elements chemistry

Number of valence electrons present in atoms of $HClO _{4},HClO _{3},HClO _{2}$ respectively are :

  1. $32,26,20$
  2. $26,20,14$
  3. $36,30,24$
  4. $28,22,16$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Number of valence electrons present in atoms of $HClO _{4},HClO _{3},HClO _{2}$ are32,26,20 respectively.
Number of valence electrons present in atoms of  $HClO _{4}$ are $1+7+4(6)=32$
Number of valence electrons present in atoms of  $HClO _{3}$ are $1+7+3(6)=26$
Number of valence electrons present in atoms of  $HClO _{2}$ are $1+7+2(6)=20$