Tag: p-block elements

Questions Related to p-block elements

What are the corresponding anhydrides of the following oxyacids:

$\displaystyle { HClO } _{ 4 }$, $\displaystyle { HClO } _{ 3 }$, $\displaystyle { HClO } _{ 2 }$ and $\displaystyle { HOCl }$.

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

  1. $\displaystyle { HClO } _{ 4 }:{ Cl } _{ 2 }{ O } _{ 3 }$

  2. $\displaystyle { HClO } _{ 3 }:{ Cl } _{ 2 }{ O } _{ 6 }$

  3. $\displaystyle { HClO } _{ 2 }:{ Cl }O _{ 2 }$

  4. $\displaystyle { HOCl }:{ Cl } _{ 2 }{ O _4 }$

Show answer
Correct Option: B,C
Explanation:
Anhydrides of oxyacids are given as:

$\displaystyle { HClO } _{ 4 }:{ Cl } _{ 2 }{ O } _{ 7 }$

$\displaystyle { HClO } _{ 3 }:{ Cl } _{ 2 }{ O } _{ 6 }$

$\displaystyle { HClO } _{ 2 }:{ Cl }O _{ 2 }$

$\displaystyle { HOCl }:{ Cl } _{ 2 }{ O }$

Correct order of hydrolysis of hexafluorides is?

group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

  1. $TeF _6 > SeF _6 > SF _6$

  2. $ SF _6 > SeF _6 > TeF _6$

  3. $SF _6 > TeF _ > SeF _6$

  4. None of these

Show answer
Correct Option: B

Which of the following trihalides on hydrosois produces hypochlorous acid?

group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

  1. $PCl _{3}$

  2. $NCl _{3}$

  3. $BiCl _{3}$

  4. $SbCl _{3}$

Show answer
Correct Option: B
Explanation:

Hydrolysis of $NCl$ gives $HOCl$ (hypochlorous acid)

${ NCl } _{ 3 }+{ 4H } _{ 2 }O\longrightarrow { N } _{ 4 }OH+3HOCl$

Which of the following can be hydrolysed?

group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

  1. $TeF _6$

  2. $NCl _3$

  3. $SF _6$

  4. Both $1$ & $2$

Show answer
Correct Option: A
Explanation:

$TeF _6$ canbe easily hydrolysed because of large size of Te central atom and low electronegativity the bond polarity of this bond is more .so, it is more reactive than other compounds like $SF _6$

$TeF _6+6H _2O\longrightarrow H _6TeO _6+6HF$

Which of the following is least stable?

group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

  1. $Tl{I} _{3}$

  2. $Tl{F} _{3}$

  3. $Pb{F} _{4}$

  4. $Pb{I} _{4}$

Show answer
Correct Option: D

Which is the correct order of decreasing basicity of halide ions?

group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

  1. ${I}^{-1}> {Br}^{-}> {Cl}^{-}> {F}^{-}$

  2. ${F}^{-}> {Cl} _{-}> {Br}^{-}> {I}^{-}$

  3. ${Cl}^{-}> {Br}^{-}> {I}^{-}> {F}^{-}$

  4. ${F}^{-}> {Cl} _{-}> {I}^{-}> {Br}^{-}$

Show answer
Correct Option: A,B

Which gas use in cooling tube in MRI tube ?

group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

  1. He

  2. Ar

  3. $CO _2$

  4. $N _2$

Show answer
Correct Option: A
Explanation:

He gas use as colling agent in super conducting magne

$PbI _4$ does not exist because :

group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

  1. iodine is not a reactive

  2. $Pb(IV)$ is oxidizing and $I^-$ is strong reducing agent

  3. $Pb(IV)$ is less stable than $Pb(II)$

  4. $Pb^{4+}$ is not easily formed

Show answer
Correct Option: C

Halogens have:

group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

  1. high ionisation energies

  2. high electronegativities

  3. high electron affinities

  4. All the above

Show answer
Correct Option: D
Explanation:

Halogens have high ionisation energies, high electronegativities and high electron affilities due to their smallest size in a particular period. As size decreases ionisation energy, elctronegativity and electron affinity increaes

Iodine is more soluble in aqueous solution of Kl because it forms soluble :

group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

  1. $\mathrm{K}\mathrm{I} _{2}$

  2. $\mathrm{K}\mathrm{I} _{3}$

  3. $\mathrm{K}\mathrm{I} _{4}$

  4. $\mathrm{K} _{2}I _{2}$

Show answer
Correct Option: B
Explanation:

$KI+I _2\rightarrow KI _3$ soluble 
$\therefore $ Iodine is more soluble in KI (aq)