Match List I with List II and select the correct answer using the code given below the lists : Code :List I
(Common Name)List II
(Chemical Formula)a. Baking soda i. CaSO4 · 2H2O b. Washing soda ii. NaHCO3 c. Gypsum iii. Na2CO3 · 10H2O d. Plaster of Paris iv. CaSO4 · ½H2O
a-ii, b-iii, c-i, d-iv
These are common sodium and calcium compounds whose everyday names are linked to their composition and water of crystallisation.
a. Baking soda is sodium hydrogencarbonate, NaHCO3 → ii.
b. Washing soda is sodium carbonate decahydrate, Na2CO3 · 10H2O → iii.
c. Gypsum is calcium sulphate dihydrate, CaSO4 · 2H2O → i.
d. Plaster of Paris is calcium sulphate hemihydrate, CaSO4 · ½H2O, obtained by heating gypsum to about 373 K → iv.
The other codes fail because they pair washing soda with gypsum's formula, give baking soda the formula of washing soda, or swap gypsum and Plaster of Paris. One code matches all four pairs, so “None of the above” is not correct.
a-ii, b-iii, c-i, d-iv option is correct.
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