Question

Match the important chemicals given in Column (A) with the
chemical formulae given in Column (B)

Answer 1

Gypsum plaster, or plaster of Paris, is produced by heating gypsum to about 300 F (150 C).

$CaSO_4 2H_2O + heat \rightarrow CaSO_4 0.5H_2O + 1.5H_2O$ (released as steam).

When the dry plaster powder is mixed with water, it re-forms into gypsum.

Thus gypsum is $CaS{O}_{4}2H_{2}O$ and Plaster of Paris is $CaS{O}_{4}1.5H_{2}O$.

Calcium hydroxide, traditionally called slaked lime, is an inorganic compound with the chemical formula $Ca(OH{)}_2$.

Calcium hypochlorite also known as bleaching powder is an inorganic compound with $Ca(ClO)_2$.

A = 2, B = 3, C = 4, D = 1 is correct match.