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ICSE Class 9 Chemistry Question 1 of 26

Study of the First Element — Hydrogen — Question 4

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4
Question

Question 4

Give balanced equations for obtaining hydrogen from cold water using –

(a) A monovalent active metal

(b) A divalent active metal

Answer

(a) Monovalent active metal Na :

2Na+2H2Ocold water⟶2NaOH+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 water⟶Ca(OH)2+H2\text{Ca} + \underset{\text{cold water}}{2\text{H}_2\text{O}} \longrightarrow \text{Ca(OH)}_2 + \text{H}_2