Why beaker become hot to touch when reaction between Na and H2O take place in it? 1. Ignition temperature of Na decreases when piece of Na is added in water & Na catches fire & produce heat 2. sodium dissolve in water & produce heat 3. chemical Rn between sodium 2 water produces hydrogen with lot of heat 4. endothermic R n takes place but Na and H2O A,B,C OR D
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