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(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’.
(b) Write chemical formula of Plaster of Paris. At what temperature gypsum is heated to obtain Plaster of Paris ?
(b) Write chemical formula of Plaster of Paris. At what temperature gypsum is heated to obtain Plaster of Paris ?
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A $\rightarrow$ Sodium hydrogen carbonate/ baking soda/ $\ce{NaHCO3}$
B $\rightarrow$ Sodium carbonate/ washing soda/ $\ce{Na2CO3}$
B $\rightarrow$ Sodium carbonate/ washing soda/ $\ce{Na2CO3}$