Match List I with List II
(A) Slaked lime   (I) NaOH
(B) Dead burnt plaster   (II) Ca(OH)$$_2$$
(C) Caustic soda   (III) Na$$_2$$CO$$_3$$ $$\cdot$$ 10H$$_2$$O
(D) Washing soda   (IV) CaSO$$_4$$

Let us match the common names with their chemical formulas:

(A) Slaked lime - Slaked lime is the common name for calcium hydroxide, $$Ca(OH)_2$$ (II). It is produced by adding water to quicklime (CaO).

(B) Dead burnt plaster - Dead burnt plaster is anhydrous calcium sulphate, $$CaSO_4$$ (IV). It is obtained by heating plaster of Paris above 393 K.

(C) Caustic soda - Caustic soda is the common name for sodium hydroxide, $$NaOH$$ (I).

(D) Washing soda - Washing soda is hydrated sodium carbonate, $$Na_2CO_3 \cdot 10H_2O$$ (III).

Therefore, the correct matching is: (A)-II, (B)-IV, (C)-I, (D)-III.