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Question
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{Ca(OH)2 + H2}\]
Options
dilute acid
dilute alkali
cold water
conc. alkali
boiling water
conc. acid
steam
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Solution
Reactant added to get the product:
\[\ce{Ca(OH)2 + H2:Cold water}\]
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