JEE Main Solved Paper 2017 Question 21
Question: Sodium salt of an organic acid ‘X’ produces effervescence with conc. $ {H_2}S{O_4}\text{.} $ ‘X’ reacts with the acidified aqueous $ CaC{l_2} $ solution to give a white precipitate which decolourises acidic solution of $ KMn{O_4}. $ ‘X’ is :- [JEE Main Solved Paper-2017]
Options:
A) $ C _6H _5COONa $
B) $ HCOONa $
C) $ CH3COONa $
D) $ Na _2C _2O _4 $
Show Answer
Answer:
Correct Answer: D
Solution:
- $ Na _2C _2O _4+\underset{conc\text{.}}{\mathop{H _2SO _4}},\xrightarrow{{}}Na _2SO _4+CO\uparrow $ $ +CO _2\infty \uparrow +H _2O $
$ Na _2C _2O _4+CaCl _2\xrightarrow{{}}\underset{(white,ppt.)}{\mathop{CaC _2O _4}},\downarrow 2NaCl $
