Which of the following correctly lists the raw materials needed to make glass?
(a) sand, sodium bicarbonate, limestone
(b) silicon, sodium bicarbonate, limestone
(c) silicon, sodium carbonate, calcium carbonate
(d) sand, sodium carbonate, calcium carbonate

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Solution

(d) sand, sodium carbonate, calcium carbonate

Sand (silicon dioxide (SiO₂), sodium carbonate (Na₂CO₃) and calcium carbonate (CaCO₃) are the three raw materials needed to make glass.

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Column (I)	Column (II)
(1) Bleaching powder	(a) Sodium bicarbonate
(2) Baking soda	(b) Sodium carbonate
(3) Washing soda	(c) Calcium oxychloride
(4) Plaster of Paris	(d) Calcium sulphate hemihydrate

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C a C O_{3} ⟶ C a O + C O_{2}

N a_{2} C O_{3} + H_{2} O + C O_{2} ⟶ 2 N a H C O_{3}

0.5

C a C O_{3} ⟶ C a O + C O_{2}

N a_{2} C O_{3} + H_{2} O + C O_{2} ⟶ 2 N a H C O_{3}

C O_{2}

0.2

{C O}_{2}

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