Answer
Verified
400.2k+ views
Hint: Phosphoric acids are strong acids. It has 3 hydrogen atoms but only 2 are isonisable. Thus it is soluble in water.
Complete step by step solution:
Phosphorus acid or phosphonic acid is a colourless deliquescent crystalline solid which is highly acidic in nature. Even though it has 3 hydrogen, only 2 are ionisable. Hence it is dibasic acid and ionises as
\[{{H}_{3}}P{{O}_{3}}\to {{H}^{+}}+{{H}_{2}}PO_{3}^{-}\]
\[{{H}_{3}}PO_{3}^{-}\to {{H}^{+}}+{{H}_{2}}PO_{3}^{2-}\]
The other hydrogen, which does not take part in ionisation, has a reducing nature. Thus \[{{H}_{3}}P{{O}_{3}}\] act as a reducing agent. So the correct answer for the question is (a).
-Phosphorus acid is obtained by hydrolysis of phosphorus trichloride and phosphorus trioxide.
-Phosphorus acid and its salts are strong reducing agents, as they are readily oxidisable to phosphoric acid and phosphates, respectively.
\[HPO_{3}^{2-}+3O{{H}^{-}}\to PO_{4}^{3-}+2{{H}_{2}}O+2{{e}^{-}}\]
- Phosphorus acid has the capability of reducing salts of copper, silver, gold etc., to their respective metals.
-The structure of phosphorus acid is shown as
-Orthophosphoric acid \[{{H}_{3}}P{{O}_{4}}\] is a tribasic weak acid. It also has 3 hydrogen atoms, but has 4 oxygen atoms. It is not a reducing agent because all the 3 of its hydrogen ionises in water. It structure is shown as
-Phosphoric acid is a syrup liquid which combines with water gives a semi hydrate \[2{{H}_{3}}P{{O}_{4}}.{{H}_{2}}O\]
-It ionises in 3 stages
\[{{H}_{3}}PO_{4}^{{}}\rightleftharpoons {{H}^{+}}+{{H}_{2}}PO_{4}^{-}\]
\[{{H}_{3}}PO_{4}^{-}\rightleftharpoons {{H}^{+}}+{{H}_{2}}PO_{4}^{2-}\]
\[{{H}_{3}}PO_{4}^{2-}\rightleftharpoons {{H}^{+}}+PO_{4}^{3-}\]
Its first ionisation takes place quite fast, but the second and third ionisation takes place very slow. It forms a series of salts.
Thus, the correct answer is option (a), Phosphorus acid is dibasic and reducing.
Note: There are chances that we assume even phosphoric acid is reducing like phosphorus acid. But it is not a reducing agent.
Complete step by step solution:
Phosphorus acid or phosphonic acid is a colourless deliquescent crystalline solid which is highly acidic in nature. Even though it has 3 hydrogen, only 2 are ionisable. Hence it is dibasic acid and ionises as
\[{{H}_{3}}P{{O}_{3}}\to {{H}^{+}}+{{H}_{2}}PO_{3}^{-}\]
\[{{H}_{3}}PO_{3}^{-}\to {{H}^{+}}+{{H}_{2}}PO_{3}^{2-}\]
The other hydrogen, which does not take part in ionisation, has a reducing nature. Thus \[{{H}_{3}}P{{O}_{3}}\] act as a reducing agent. So the correct answer for the question is (a).
-Phosphorus acid is obtained by hydrolysis of phosphorus trichloride and phosphorus trioxide.
-Phosphorus acid and its salts are strong reducing agents, as they are readily oxidisable to phosphoric acid and phosphates, respectively.
\[HPO_{3}^{2-}+3O{{H}^{-}}\to PO_{4}^{3-}+2{{H}_{2}}O+2{{e}^{-}}\]
- Phosphorus acid has the capability of reducing salts of copper, silver, gold etc., to their respective metals.
-The structure of phosphorus acid is shown as
-Orthophosphoric acid \[{{H}_{3}}P{{O}_{4}}\] is a tribasic weak acid. It also has 3 hydrogen atoms, but has 4 oxygen atoms. It is not a reducing agent because all the 3 of its hydrogen ionises in water. It structure is shown as
-Phosphoric acid is a syrup liquid which combines with water gives a semi hydrate \[2{{H}_{3}}P{{O}_{4}}.{{H}_{2}}O\]
-It ionises in 3 stages
\[{{H}_{3}}PO_{4}^{{}}\rightleftharpoons {{H}^{+}}+{{H}_{2}}PO_{4}^{-}\]
\[{{H}_{3}}PO_{4}^{-}\rightleftharpoons {{H}^{+}}+{{H}_{2}}PO_{4}^{2-}\]
\[{{H}_{3}}PO_{4}^{2-}\rightleftharpoons {{H}^{+}}+PO_{4}^{3-}\]
Its first ionisation takes place quite fast, but the second and third ionisation takes place very slow. It forms a series of salts.
Thus, the correct answer is option (a), Phosphorus acid is dibasic and reducing.
Note: There are chances that we assume even phosphoric acid is reducing like phosphorus acid. But it is not a reducing agent.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
Three beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurred
What is the stopping potential when the metal with class 12 physics JEE_Main
The momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_Main
How do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSE
Is H mCT and q mCT the same thing If so which is more class 11 chemistry CBSE
Trending doubts
Assertion CNG is a better fuel than petrol Reason It class 11 chemistry CBSE
How does pressure exerted by solid and a fluid differ class 8 physics CBSE
Number of valence electrons in Chlorine ion are a 16 class 11 chemistry CBSE
What are agricultural practices? Define
What does CNG stand for and why is it considered to class 10 chemistry CBSE
The rate of evaporation depends on a Surface area b class 9 chemistry CBSE
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
State whether the following statement is true or false class 11 physics CBSE
A night bird owl can see very well in the night but class 12 physics CBSE