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when calcium oxide reacts with water why hydrogen gas is not formed?(even though heat is released)

Posted by Pratibha Kumari Kumari 5 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 4 years, 11 months ago

The formation of slaked lime (calcium hydroxide, Ca(OH)2) when water is added to lime (CaO) is exothermic. CaO(s) + H2O (l) → Ca(OH)2(s) This reaction occurs when water is added to dry portland cement to make concrete, and heat evolution of energy as heat is evident because the mixture becomes warm.

Calcium is a silvery-white metal; it is relatively soft, but much harder than sodium metal. Calcium is a member of the alkaline-earth metals (Group II on the periodic table); these metals react vigorously with water, although not as violently as the Group I metals such as sodium or potassium:

Ca(s) + 2H2O(l) ——> Ca(OH)2(aq) + H2(g)

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