Question

05. The following reaction is an example of CaO(s) +H2O(I) -> Ca(OH)(aq)
I. Displacement reaction
II. Combination reaction
III. Decomposition reaction
IV Exothermic reaction .
(a) Only (III)
(b)(i) and (III)
(c)(II) and (IV)
(d) Only (1)​

Answer 1

CaO + H2O → Ca(OH)2

This reaction is a combination reaction as calcium oxide, and water combines to form a single product that is calcium hydroxide.

   A combination reaction is a reaction in which two reactants combine to form one product. Oxygen and halogens are very reactive elements and undergo combination reactions with other elements.

   This is an exothermic chemical reaction and gives off heat.

It is combination reaction

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Answer 2

(c) (II) and (IV) is the correct answer about calcium hydroxide formation.

1. Combination reaction, as evident by it's name, results in combination of reactants thus leading to production of one product.
2. Exothermic reaction is the type of reaction where heat is released.
3. The warming of mixture states the reaction to be of exothermic type.
4. This reaction is commonly seen in mixing of cement with water, which results in production of calcium hydroxide, which is used for whitewashing of walls.