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Chemistry

Give balanced equations for obtaining hydrogen from cold water using –

(a) A monovalent active metal

(b) A divalent active metal

Hydrogen

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Answer

(a) Monovalent active metal Na :

2Na+2H2Ocold water2NaOH+H22\text{Na} + \underset{\text{cold water}}{2\text{H}2\text{O}} \longrightarrow 2\text{NaOH} + \text{H}2

(b) Divalent active metal Ca :
Ca+2H2Ocold waterCa(OH)2+H2\text{Ca} + \underset{\text{cold water}}{2\text{H}2\text{O}} \longrightarrow \text{Ca(OH)}2 + \text{H}_2

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