Question

Match the salts given in column $I$with their method of preparation given in column $II$.

Column 1	Column 2
$\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2\mathrm{from}\mathrm{PbO}$	Simple displacement
${\mathrm{MgCl}}_2\mathrm{from}\mathrm{Mg}$	Titration
${\mathrm{FeCl}}_3\mathrm{from}\mathrm{Fe}$	Neutralisation
${\mathrm{NaNO}}_3\mathrm{from}\mathrm{NaOH}$	Precipitation
${\mathrm{ZnCO}}_3\mathrm{from}{\mathrm{ZnSO}}_4$	Combustion

Answer 1

1. $\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2\mathrm{from}\mathrm{PbO}$ = (IV) $$\begin{gathered} \mathrm{PbO}+{\mathrm{NO}}_2+\mathrm{O}\to \mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2 \\ (\mathrm{lead}(\mathrm{nitrogen}(\mathrm{necent}(\mathrm{lead}\mathrm{nitrate}\left) \\ \mathrm{oxide}\right)\mathrm{di}-\mathrm{xide})\mathrm{oxygen}) \end{gathered}$$

1. Lead nitrate white precipitate form in these reaction this is a precipitation reaction.

B. ${\mathrm{MgCl}}_2\mathrm{from}\mathrm{Mg}$ = (I) $$\begin{gathered} \mathrm{Mg}+{\mathrm{Cl}}_2\to {\mathrm{MgCl}}_2 \\ \left(\mathrm{magnesium}\right)\left(\mathrm{chloride}\right)(\mathrm{magnesium} \\ \mathrm{chloride}) \end{gathered}$$

1. Displacement of magnesium ion to salt to magnesium chloride.

C. ${\mathrm{FeCl}}_3\mathrm{from}\mathrm{Fe}$ = (V) $$\begin{gathered} \mathrm{Fe}+{\mathrm{Cl}}_2\to {\mathrm{FeCl}}_3 \\ \left(\mathrm{iron}\right)\left(\mathrm{chlorine}\right)(\mathrm{iron}\mathrm{chloride}) \end{gathered}$$

1. When iron and chlorine give of iron chloride combustion takes place.

D. ${\mathrm{NaNO}}_3\mathrm{from}\mathrm{NaOH}$ = (III) $$\begin{gathered} {\mathrm{HNO}}_3+\mathrm{NaOH}\to {\mathrm{NaNO}}_3+{\mathrm{H}}_2\mathrm{O} \\ (\mathrm{nitric}(\mathrm{sodium}(\mathrm{sodium}(\mathrm{water}\left) \\ \mathrm{acid}\right)\mathrm{hydroxide})\mathrm{nitrate}) \end{gathered}$$

1. Oxidation state on both product and reactant are same it is a neutralization reaction.

E. ${\mathrm{ZnCO}}_3\mathrm{from}{\mathrm{ZnSO}}_4$ = (II) $$\begin{gathered} {\mathrm{ZnSO}}_4+{\mathrm{Na}}_2{\mathrm{CO}}_3\to {\mathrm{ZnCO}}_3+{\mathrm{Na}}_2{\mathrm{SO}}_4 \\ (\mathrm{zinc}(\mathrm{sodium}(\mathrm{zinc}(\mathrm{sodium} \\ \mathrm{sulfate})\mathrm{carbonate})\mathrm{carbonate})\mathrm{sulfate}) \end{gathered}$$

1. We can find the unknown value of ${\mathrm{ZnCO}}_3$ from known ${\mathrm{ZnSO}}_4$ by titration.

The final solution :

Column I	Column II
A. $\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2\mathrm{from}\mathrm{PbO}$	(IV) Precipitation
B. ${\mathrm{MgCl}}_2\mathrm{from}\mathrm{Mg}$	(I) Simple displacement
C. ${\mathrm{FeCl}}_3\mathrm{from}\mathrm{Fe}$	(V) Combustion
D. ${\mathrm{NaNO}}_3\mathrm{from}\mathrm{NaOH}$	(III) Neutralization
E. ${\mathrm{ZnCO}}_3\mathrm{from}{\mathrm{ZnSO}}_4$	(II) Titration