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A chemist attempts to extinguish a laboratory fire caused by the violent reaction of Hydrolith () wiHydrogen Chemistry Question

Question

A chemist attempts to extinguish a laboratory fire caused by the violent reaction of Hydrolith ($CaH_2$) with a water spill. The chemist uses a standard $CO_2$ fire extinguisher, but the fire worsens. What is the precise chemical reason for this exacerbation?

Answer: B

💡 Solution & Explanation

Saline hydrides (like $CaH_2$ or $NaH$) burn in water producing $H_2$ fires. A $CO_2$ extinguisher fails because the extremely hot, powerful metal hydride reduces the $CO_2$ directly into formate ($HCOO^-$) or Carbon Monoxide, rendering the extinguisher useless and dangerous. Sand must be used.

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