316838
As the number of \(-\mathrm{OH}\) groups increases in hypophosphorus acid, phosphorus acid and phosphoric acid, the acidic strength
1 increases
2 decreases
3 remain nearly same
4 remain appropriately same
Explanation:
\(\mathrm{H}_{3} \mathrm{PO}_{2}\) has \(1-\mathrm{OH}\) group, \(\mathrm{H}_{3} \mathrm{PO}_{3}\) has \(2-\mathrm{OH}\) groups and \(\mathrm{H}_{3} \mathrm{PO}_{4}\) has 3 \(\mathrm{OH}\) groups. In these acid although the number of \(-\mathrm{OH}\) groups (ionisable hydrogen) increases, yet the acidity does not increase very much.This is due to the fact that the number of unprotonated oxygen, responsible for the enhancement of acidity due to inductive effect, remains the same with the result dissociation constant also remain nearly same.
CHXI11:THE P-BLOCK ELEMENTS
316839
Strong reducing behaviour of \(\mathrm{H}_{3} \mathrm{PO}_{2}\) is due to
1 Low oxidation state of phosphorus
2 Presence of two - \(\mathrm{OH}\) groups and one \(\mathrm{P}-\mathrm{H}\) bond
3 Presence of one - \(\mathrm{OH}\) group and two \({\rm{P - H}}\) bonds
4 High electron gain enthalpy of phosphorus
Explanation:
\(\mathrm{P}-\mathrm{H}\) bonds in oxoacids of \(\mathrm{P}\) are responsible for reducing ability.
CHXI11:THE P-BLOCK ELEMENTS
316840
Which among the following oxoacids of phosphorus shows a tendency of disproportionation?
Phosphonic acid \(\left(\mathrm{H}_{3} \mathrm{PO}_{3}\right)\), oxoacid of phosphorus shows a tendency of disproportionation. On heating \(\mathrm{H}_{3} \mathrm{PO}_{3}\) disproportionates to give orthophosphoric acid and phosphene gas. \(4 \mathrm{H}_{3} \mathrm{PO}_{3} \stackrel{\Delta}{\longrightarrow} 3 \mathrm{H}_{3} \mathrm{PO}_{4}+\mathrm{PH}_{3}\)
CHXI11:THE P-BLOCK ELEMENTS
316841
Phosphonic acids, phosphinic acid is the correct statement for the given acids?
1 Both are diprotic acids
2 Both are triprotic acids
3 Phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid
4 Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid
316838
As the number of \(-\mathrm{OH}\) groups increases in hypophosphorus acid, phosphorus acid and phosphoric acid, the acidic strength
1 increases
2 decreases
3 remain nearly same
4 remain appropriately same
Explanation:
\(\mathrm{H}_{3} \mathrm{PO}_{2}\) has \(1-\mathrm{OH}\) group, \(\mathrm{H}_{3} \mathrm{PO}_{3}\) has \(2-\mathrm{OH}\) groups and \(\mathrm{H}_{3} \mathrm{PO}_{4}\) has 3 \(\mathrm{OH}\) groups. In these acid although the number of \(-\mathrm{OH}\) groups (ionisable hydrogen) increases, yet the acidity does not increase very much.This is due to the fact that the number of unprotonated oxygen, responsible for the enhancement of acidity due to inductive effect, remains the same with the result dissociation constant also remain nearly same.
CHXI11:THE P-BLOCK ELEMENTS
316839
Strong reducing behaviour of \(\mathrm{H}_{3} \mathrm{PO}_{2}\) is due to
1 Low oxidation state of phosphorus
2 Presence of two - \(\mathrm{OH}\) groups and one \(\mathrm{P}-\mathrm{H}\) bond
3 Presence of one - \(\mathrm{OH}\) group and two \({\rm{P - H}}\) bonds
4 High electron gain enthalpy of phosphorus
Explanation:
\(\mathrm{P}-\mathrm{H}\) bonds in oxoacids of \(\mathrm{P}\) are responsible for reducing ability.
CHXI11:THE P-BLOCK ELEMENTS
316840
Which among the following oxoacids of phosphorus shows a tendency of disproportionation?
Phosphonic acid \(\left(\mathrm{H}_{3} \mathrm{PO}_{3}\right)\), oxoacid of phosphorus shows a tendency of disproportionation. On heating \(\mathrm{H}_{3} \mathrm{PO}_{3}\) disproportionates to give orthophosphoric acid and phosphene gas. \(4 \mathrm{H}_{3} \mathrm{PO}_{3} \stackrel{\Delta}{\longrightarrow} 3 \mathrm{H}_{3} \mathrm{PO}_{4}+\mathrm{PH}_{3}\)
CHXI11:THE P-BLOCK ELEMENTS
316841
Phosphonic acids, phosphinic acid is the correct statement for the given acids?
1 Both are diprotic acids
2 Both are triprotic acids
3 Phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid
4 Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid
NEET Test Series from KOTA - 10 Papers In MS WORD
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CHXI11:THE P-BLOCK ELEMENTS
316838
As the number of \(-\mathrm{OH}\) groups increases in hypophosphorus acid, phosphorus acid and phosphoric acid, the acidic strength
1 increases
2 decreases
3 remain nearly same
4 remain appropriately same
Explanation:
\(\mathrm{H}_{3} \mathrm{PO}_{2}\) has \(1-\mathrm{OH}\) group, \(\mathrm{H}_{3} \mathrm{PO}_{3}\) has \(2-\mathrm{OH}\) groups and \(\mathrm{H}_{3} \mathrm{PO}_{4}\) has 3 \(\mathrm{OH}\) groups. In these acid although the number of \(-\mathrm{OH}\) groups (ionisable hydrogen) increases, yet the acidity does not increase very much.This is due to the fact that the number of unprotonated oxygen, responsible for the enhancement of acidity due to inductive effect, remains the same with the result dissociation constant also remain nearly same.
CHXI11:THE P-BLOCK ELEMENTS
316839
Strong reducing behaviour of \(\mathrm{H}_{3} \mathrm{PO}_{2}\) is due to
1 Low oxidation state of phosphorus
2 Presence of two - \(\mathrm{OH}\) groups and one \(\mathrm{P}-\mathrm{H}\) bond
3 Presence of one - \(\mathrm{OH}\) group and two \({\rm{P - H}}\) bonds
4 High electron gain enthalpy of phosphorus
Explanation:
\(\mathrm{P}-\mathrm{H}\) bonds in oxoacids of \(\mathrm{P}\) are responsible for reducing ability.
CHXI11:THE P-BLOCK ELEMENTS
316840
Which among the following oxoacids of phosphorus shows a tendency of disproportionation?
Phosphonic acid \(\left(\mathrm{H}_{3} \mathrm{PO}_{3}\right)\), oxoacid of phosphorus shows a tendency of disproportionation. On heating \(\mathrm{H}_{3} \mathrm{PO}_{3}\) disproportionates to give orthophosphoric acid and phosphene gas. \(4 \mathrm{H}_{3} \mathrm{PO}_{3} \stackrel{\Delta}{\longrightarrow} 3 \mathrm{H}_{3} \mathrm{PO}_{4}+\mathrm{PH}_{3}\)
CHXI11:THE P-BLOCK ELEMENTS
316841
Phosphonic acids, phosphinic acid is the correct statement for the given acids?
1 Both are diprotic acids
2 Both are triprotic acids
3 Phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid
4 Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid
316838
As the number of \(-\mathrm{OH}\) groups increases in hypophosphorus acid, phosphorus acid and phosphoric acid, the acidic strength
1 increases
2 decreases
3 remain nearly same
4 remain appropriately same
Explanation:
\(\mathrm{H}_{3} \mathrm{PO}_{2}\) has \(1-\mathrm{OH}\) group, \(\mathrm{H}_{3} \mathrm{PO}_{3}\) has \(2-\mathrm{OH}\) groups and \(\mathrm{H}_{3} \mathrm{PO}_{4}\) has 3 \(\mathrm{OH}\) groups. In these acid although the number of \(-\mathrm{OH}\) groups (ionisable hydrogen) increases, yet the acidity does not increase very much.This is due to the fact that the number of unprotonated oxygen, responsible for the enhancement of acidity due to inductive effect, remains the same with the result dissociation constant also remain nearly same.
CHXI11:THE P-BLOCK ELEMENTS
316839
Strong reducing behaviour of \(\mathrm{H}_{3} \mathrm{PO}_{2}\) is due to
1 Low oxidation state of phosphorus
2 Presence of two - \(\mathrm{OH}\) groups and one \(\mathrm{P}-\mathrm{H}\) bond
3 Presence of one - \(\mathrm{OH}\) group and two \({\rm{P - H}}\) bonds
4 High electron gain enthalpy of phosphorus
Explanation:
\(\mathrm{P}-\mathrm{H}\) bonds in oxoacids of \(\mathrm{P}\) are responsible for reducing ability.
CHXI11:THE P-BLOCK ELEMENTS
316840
Which among the following oxoacids of phosphorus shows a tendency of disproportionation?
Phosphonic acid \(\left(\mathrm{H}_{3} \mathrm{PO}_{3}\right)\), oxoacid of phosphorus shows a tendency of disproportionation. On heating \(\mathrm{H}_{3} \mathrm{PO}_{3}\) disproportionates to give orthophosphoric acid and phosphene gas. \(4 \mathrm{H}_{3} \mathrm{PO}_{3} \stackrel{\Delta}{\longrightarrow} 3 \mathrm{H}_{3} \mathrm{PO}_{4}+\mathrm{PH}_{3}\)
CHXI11:THE P-BLOCK ELEMENTS
316841
Phosphonic acids, phosphinic acid is the correct statement for the given acids?
1 Both are diprotic acids
2 Both are triprotic acids
3 Phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid
4 Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid
