Question

Which of the following reactions involves both
neutralisation and precipitation?
(1) Ca(OH)2 + CO2 ---------> CaCO3 + H2O
(2) NaOH + HCl ----------> NaCl + H2O
(3) BaCl2 + Na2SO4 ----------> BaSO4 + 2NaCl
(4) Pb(NO3)2 + 2KI ---------> PbI2 + 2KNO3

Answer 1

answer : option (1)

explanation :

$Ca(OH)_2+CO_2\rightarrow CaCO_3\downarrow+H_2O$

this reaction involves both neutralisation and precipitation.

$NaOH+HCl\rightarrow NaCl+H_2O$

this reaction involves neutralisation reaction.

$BaCl_2+Na_2SO_4\rightarrow BaSO_4\downarrow+2NaCl$

this reaction involves precipitation.

$Pb(NO_3)_2+2KI\rightarrow PbI_2\downarrow+2KNO_3$

This reaction involves precipitation

hence, option (1) involves both neutralisation and precipitation.