1.

9. What is the action of heat onWashing soda(i)(ii) Lime stone

Answer»

i. Action of Heat:- When the crystals of washing soda are heated strongly then all the water of crystallizationevaporatesleaving behind anhydrous sodium carbonate.

ii. If limestone is heated strongly, itbreaksdown to form calcium oxide and carbon dioxide. Calcium oxide is also called quicklime. It is yellow when hot, but white when cold. It decomposes into calcium oxide and carbon dioxide .this is a thermal decomposition reaction.



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