Aluminium carbide reacts with water according to the following equation:

${\mathrm{Al}}_4{\mathrm{C}}_3+12{\mathrm{H}}_2\mathrm{O} \stackrel{}{\to } 3{\mathrm{CH}}_4+4\mathrm{Al}{\left(\mathrm{OH}\right)}_3$

Calculate the volume of methane $\left({\mathrm{CH}}_4\right)$ measured at STP from $14.4 \mathrm{g}$ of aluminium carbide by an excess of water.

$[\mathrm{Al}=27, \mathrm{C}=12, \mathrm{H}=1]$

 

 

 

From the following formulae:

$\mathrm{AgCl}, {\mathrm{CuCO}}_3, {\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}, {\mathrm{KNO}}_3, \mathrm{NaCl}, {\mathrm{NaHSO}}_4, \mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2, {\mathrm{ZnCO}}_3, {\mathrm{ZnSO}}_4.7{\mathrm{H}}_2\mathrm{O}.$

Choose one having the following description.

An acid salt.

From the following formulae:

Choose one having the following description.

An insoluble chloride.

From the following formulae:

Choose one having the following description.

Changes from blue to white on heating with conc.${\mathrm{H}}_2{\mathrm{SO}}_4.$

From the following formulae:

Choose one having the following description.

Changes from green to black on heating.