Tag: p- block elements-ii

Questions Related to p- block elements-ii

$P 4 + 6Cl _2\, \rightarrow$_______

chemistry p- block elements-ii compounds of phosphorus - pcl3 phosphorus halides compounds of phosphorus compounds of phosphorus- pcl5

  1. $2P _2Cl _2$

  2. $4PCl _3$

  3. $PCl _6$

  4. $P _2Cl _5$

Show answer
Correct Option: B
Explanation:

The correct chemical equation is :

$P _4 + 6Cl _2 \rightarrow 4PCl _3$

$\mathrm{B}$ottle of $\mathrm{P}\mathrm{C}l _{3}$ is kept stoppered because it :

chemistry p- block elements-ii compounds of phosphorus - pcl3 phosphorus halides compounds of phosphorus compounds of phosphorus- pcl5

  1. explodes

  2. gets oxidized

  3. is volatalised

  4. reacts with moisture

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Correct Option: D
Explanation:

Solution:-
$PCl _3+3H _2O\rightarrow H _3\ PO _3+3HCl$


$PCl _3$ reacts rapidly and exothermically with water to form phosphorus acid ,$H _3PO _3$ and $HCl$.

Option D is correct.

The products of the hydrolysis of $\mathrm{P}\mathrm{Cl} _{3}$ are :

chemistry p- block elements-ii compounds of phosphorus - pcl3 phosphorus halides compounds of phosphorus compounds of phosphorus- pcl5

  1. $\mathrm{H}\mathrm{Cl},\ \mathrm{H} _{3}\mathrm{P}\mathrm{O} _{4}$

  2. $\mathrm{H}\mathrm{Cl},\ \mathrm{H} _{3}\mathrm{P}\mathrm{O} _{3}$

  3. $\mathrm{Cl} _{2},\ \mathrm{H} _{3}\mathrm{P}\mathrm{O} _{3}$

  4. $\mathrm{H}\mathrm{Cl},\ \mathrm{P}\mathrm{O}\mathrm{Cl} _{3},\ \mathrm{H} _{3}\mathrm{P}\mathrm{O} _{4}$

Show answer
Correct Option: B
Explanation:

 Hydrolysis of $PCl _3$ gives:

$2PCl _3+6H _2O\rightarrow 2H _3PO _3+6H+$

$PCl _3+3H _2O\rightarrow H _3PO _3+3H+$

Option B is correct.

The products formed by the complete hydrolysis of $P{Cl} _{3}$ are:

chemistry p- block elements-ii compounds of phosphorus - pcl3 phosphorus halides compounds of phosphorus compounds of phosphorus- pcl5

  1. ${H} _{3}{PO} _{3}$ and $HCl$

  2. $PO{Cl} _{3}$ and $HCl$

  3. ${H} _{3}{PO} _{4}$ and $HCl$

  4. ${H} _{4}{P} _{2}{O} _{7}$ and $HCl$

Show answer
Correct Option: A
Explanation:
The products formed by the complete hydrolysis of $PCl _3$ are as follow:
$PC{ l } _{ 3 }+3{ H } _{ 2 }O\rightarrow { H } _{ 3 }P{ O } _{ 3 }+3HCl$

${ H } _{ 3 }P{ O } _{ 3 }$ and $HCl$ are the products formed.

On hydrolysis, $PCI _3$ gives :

chemistry p- block elements-ii compounds of phosphorus - pcl3 phosphorus halides compounds of phosphorus compounds of phosphorus- pcl5

  1. $H _3PO _3$

  2. $H _3PO _4$

  3. $POCI _3$

  4. $HPO _3$

Show answer
Correct Option: A
Explanation:
$PCl _{3}$ on hydrolysis gives $HCl$ and $ H _{3}PO _{3}$

$PCl _{3}+ 3H _{2}O\rightarrow H _{3}PO _{3}+3HCl$

Phosphorus trichloride reacts violently with water forming phosphorous acid.

Option (A) is correct .

Choose the correct statement.

chemistry p- block elements-ii compounds of phosphorus - pcl3 phosphorus halides compounds of phosphorus compounds of phosphorus- pcl5

  1. White or yellow phosphorus is stored under water

  2. Ignition temperature of red phosphorus is low

  3. Black phosphorus is non crystalline in nature

  4. Phosphorus does not form hydrides

Show answer
Correct Option: A
Explanation:

Due to low ignition temperature of white phosphorus, it undergoes oxidation in presence of air which slowly raises its temperature and after a few moments it catches fire spontaneously. Due to this reason, it is stored under water. Ignition temperature ofred phosphorus is high Black phosphorus is crystalline in nature. Phosphorus forms a number of hydrides

What is the color of $ {P}{Cl} _{3} $ ?

chemistry p- block elements-ii compounds of phosphorus - pcl3 phosphorus halides compounds of phosphorus compounds of phosphorus- pcl5

  1. White

  2. Colorless

  3. Brown

  4. Bright yellow

Show answer
Correct Option: B
Explanation:

${P}{Cl} _{3}$ is a colorless liquid or has a slight yellow color (but not bright yellow).

Is ${PCl} _{3}$ soluble in water?

chemistry p- block elements-ii compounds of phosphorus - pcl3 phosphorus halides compounds of phosphorus compounds of phosphorus- pcl5

  1. Not Soluble

  2. May be

  3. Partially soluble

  4. Soluble

Show answer
Correct Option: D
Explanation:
like dissolve like. It means polar molecules dissolves in polar molecules and non-polar molecules.Molecules dissolves in non polar molecules $Water$ and $PCl _3$ both are polar molecules because of their shape and electronegative difference between $H$ and $O$ in water and $P$ and $Cl$ in $PCl _3$. Hence $PCl _3$ is solube in water.
$PCl _3$ dissolve in water to form phosphorous acid.
$PCl _3$ $+$ $3H _2O$  $\longrightarrow $   $H _3PO _3$ $+$ $3HCl$

What is the odor of $ {P}{Cl} _{3}$ ?

chemistry p- block elements-ii compounds of phosphorus - pcl3 phosphorus halides compounds of phosphorus compounds of phosphorus- pcl5

  1. Pungent

  2. Fishy

  3. Sweet

  4. None of the above

Show answer
Correct Option: A
Explanation:

Phosphorus trichloride is prepared from phosphorus and chlorine. It has a pungent and irritating odour that is similar to that of hydrochloric acid.

What is the density of ${PCl} _{3}$?

chemistry p- block elements-ii compounds of phosphorus - pcl3 phosphorus halides compounds of phosphorus compounds of phosphorus- pcl5

  1. $2.0 g/cc$

  2. $2.g/cc$

  3. ${1.57g/cc}$

  4. $3.0g/cc$

Show answer
Correct Option: C
Explanation:

The density of phosphorus trichloride is ${1.57}$ ${gm}{/}{cm}^{3}$