
A balanced equation for the conversion of phosphorus to phosphoric acid is given by:
A.
B.
C.
D.
Answer
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Hint: Phosphorus belongs to group of the periodic table and is placed just below Nitrogen.
-Its compounds with oxygen and hydrogen are known as oxoacids of phosphorus.
-One of its allotropes reacts with Nitric Acid to form an oxoacid of phosphorus which is tribasic.
Complete step by step solution:
In the given question in all the four reactions an allotrope of phosphorus is reacting with Nitric Acid to give an oxoacid of phosphorus, water and Nitrogen dioxide
As we Know that only one allotrope of phosphorus reacts with nitric acid to give an oxoacid of phosphorus which is “Red Phosphorus”
This is done by heating red phosphorus with as follow:
Hence, option “D” is the correct answer.
Additional Information:
- Red phosphorus is odorless and has a specific gravity of . It is non-poisonous in nature, in contrast to the white phosphorus allotrope. Upon heating to temperatures above red phosphorus undergoes crystallization.
-It does not glow in the dark and is insoluble in water.
Note:
-Remember “C” cannot be the answer even though the reactants and products are same as in option “D”
This is because the reaction is not balanced as shown below
In this reaction we can see that the number of hydrogen atoms in the reactant side is three while on the product side it is five making the reaction unbalanced.
Red Phosphorus has a polymeric structure. It consists chains of tetrahedral linked together
-This polymeric links make red Phosphorus more stable and less reactive
This is the reason that the reaction
is done in the presence of a crystal of iodine which acts as a catalyst.
-Its compounds with oxygen and hydrogen are known as oxoacids of phosphorus.
-One of its allotropes reacts with Nitric Acid to form an oxoacid of phosphorus which is tribasic.
Complete step by step solution:
In the given question in all the four reactions an allotrope of phosphorus is reacting with Nitric Acid
As we Know that only one allotrope of phosphorus reacts with nitric acid to give an oxoacid of phosphorus which is “Red Phosphorus”
This is done by heating red phosphorus with
Hence, option “D” is the correct answer.
Additional Information:
- Red phosphorus is odorless and has a specific gravity of
-It does not glow in the dark and is insoluble in water.
Note:
-Remember “C” cannot be the answer even though the reactants and products are same as in option “D”
This is because the reaction is not balanced as shown below
In this reaction we can see that the number of hydrogen atoms in the reactant side is three while on the product side it is five making the reaction unbalanced.
Red Phosphorus has a polymeric structure. It consists chains of
-This polymeric links make red Phosphorus more stable and less reactive
This is the reason that the reaction
is done in the presence of a crystal of iodine which acts as a catalyst.
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