A white powdered solid is added to ,producing hissing sound. Identify the compound. How does this compound reacts with moist hydrogen chloride gas.
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Ans: Calcium oxide is the white powdered solid that produces a hissing sound when added to water. The reaction is exothermic in nature so that the heat releases with the release of sound on addition .Product formed is Calcium hydroxide [ Ca(OH)₂] CaO + H₂O → Ca(OH)₂
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