Analytical Chemistry Question 39
Question: Gas $ A $ is bubbled through slaked lime when a white precipitate is formed. On prolonged bubbling, the precipitate is dissolved. on heating the resultant solution, the white precipitate reappears with the evolution of gas $ B $ . The gases $ A $ and $ B $ respectively are
[DPMT 2004]
Options:
A) $ CO_2 $ and $ CO $
B) $ CO $ and $ CO_2 $
C) $ CO $ and $ CO $
D) $ CO_2 $ and $ CO_2 $
Show Answer
Answer:
Correct Answer: D
Solution:
According to the equation, $ Ca{{(OH)}_2}+CO_2\xrightarrow{\Delta }CaCO_3+H_2O $
$ CaCO_3+H_2O+CO_2\xrightarrow{{}}Ca{{(HCO_3)}_2} $
$ Ca{{(HCO_3)}_2}\xrightarrow{\Delta }CaO+H_2O+2CO_2 $ Hence, the gas A and B are $ CO_2 $ and $ CO_2 $ respectively
BETA
