(a) Take some water in a test tube. Add a few pieces of calcium hydroxide or sodium hydroxide to the water and feel the tube from the outside. Did it feel hot or cold?
(b) Put a lump of quicklime in water and watch what happens. Then touch the container with your hand. Say what change you notice, hotter or colder.
Discussion
Why did the test tube become warm in both cases?
What are such reactions called?
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