Question

Name the type of chemical reaction represented by the following equation: (a) CaO + H2O Ca(OH)2 (b) 3BaCl2 + Al(SO4)3 2AlCl3 + 3BaSO4 (c) 2FeSO4 HeatFe2O3 + SO2 + SO3

Answer 1

CaO + H2O ----> Ca(OH)2 + heat.

This is a combustion reaction because here two reactants combine to form a single product.
This is also exothermic as it releases heat.


3BaCl2 + Al2(SO4)3 -----> 2AlCl3 + 3BaSO4.

This is a double displacement reaction as radicals mutually exchange the position.


2FeSO4 -------> Fe2O3 + SO2 + SO3.

This is a decomposition reaction as a single reactant is broken into many products.
Further , it is a thermal decomposition reaction because heat energy is used for this decomposition.

- Maheshwaran.

Answer 2

(a)     $CaO + H_{2}O --- > Ca(OH)_2$

This is a combustion reaction since two elements are joined together to form a single element.

(b)    $3BaCl_2 + Al(SO_4)_3 --- > 2AlCl_3 +3BaSO_4$

 This is a double displacement reaction

(c)       $2FeSO_4 --- > Fe_2SO_3 +SO_2 + SO_3$

As single compound is broken into many products, we can call this a decomposition reaction.

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