S Block Elements Question 48
Question: White P reacts with caustic soda, the products are $ PH_3 $ and $ NaH_2PO_2 $ . This reaction is an example of
[DCE 2003]
Options:
A) Oxidation
B) Reduction
C) Disproportionation
D) Neutralisation
Show Answer
Answer:
Correct Answer: C
Solution:
In this reaction, phosphorus is simultaneously oxidised to $ NaH_2PO_2 $ and reduced to $ PH_3 $ . Hence this reaction is an example of disproportionation. $ {{\overset{o}{\mathop{P}}}_4}+3NaOH+3H_2O\to 3NaH_2\overset{+1}{\mathop{P}}O_2^{{}}+\overset{-3}{\mathop{P}}H_3^{{}} $
BETA
