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Sodium fire in the laboratory should not be extinguished by pouring water . Why ? |
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Answer» Solution :The reaction of sodium with `H_(2)O` is so exothermic that the `H_(2)` produced CATCHES fire . `2 Na + 2 H_(2)O to 2 NaOH + H_(2)` As a result , the fire spreads rather than being extinguished . Therefore , `H_(2)O` should not be USED for EXTINGUISHING sodium fire . instead pyrene `(C Cl_(4))` should be used . When `C Cl_(4)` is sprinkled over fire , it being volatile (b.p. 350 K) immediately forms vapours . These vapours being non-inflammable and heavy , SURROUND the fire . As a result , supply of air is cut off and the fire gets extinguished . |
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