(a) A compound 'A' is used in soda-lime fire-extinguisher and decomposes on heating to form compound 'B'. Compound 'B' is used for removing permanent hardness of water. Identify 'A' and 'B'. [1] (b) Write chemical formula of Plaster of Paris. At what temperature gypsum is heated to obtain Plaster…

Question

(a) A compound 'A' is used in soda-lime fire-extinguisher and decomposes on heating to form compound 'B'. Compound 'B' is used for removing permanent hardness of water. Identify 'A' and 'B'. [1] (b) Write chemical formula of Plaster of Paris. At what temperature gypsum is heated to obtain Plaster of Paris ? [1]

Aicharya · Accepted Answer

(a) A → Sodium hydrogen carbonate/ baking soda/ NaHCO 3 B → Sodium carbonate/ washing soda/ Na 2 CO 3 PAGE 6 {31-4-1} (b) • CaSO 4  2 H 2 O • 373K / 100C

(a) A compound 'A' is used in soda-lime fire-extinguisher and decomposes on heating to form compound 'B'.…

Solution