Question

Which of the following is incorrect about sodium carbonate ?
A. With hot milk of lime, it reacts to form sodium hydroxide
B. It reacts with dilute mineral acids evolving `CO_(2)(g)`
C. It undergoes hydrolysis to form an acidic solution
D. None of these

Answer 1

Correct Answer - C
Being a salt of a strong base (NaOH) and weak acid `(H_(2)CO_(3))`, when dissovled in water, sodium carbonate undergoes hydrolysis to form an alkaline solution. ,brgt `Na_(2)CO_(3)+2H_(2)OhArrH_(2)CO_(3)+2NaOH`
or `CO_(3)^(2-)+2H-OHhArrH_(2)CO_(3)+2OH^(-)` ltbr Milk of lime is a suspension o line in water.
(1) `Na_(2)CO_(3)+Ca(OH)_(2)toCaCO_(3)darr+2NaOH`
(2). `NaCO_(3)+2HCl to 2NaCl+H_(2)O+CO_(3)uarr`