NCERT Solutions for Class 10 Science Chapter 1
Important Board Questions
Chemical Reactions and Equations
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Long Type Question
Questions No: 1
White Wash Was being done at Mukesh’ s house. Mukesh saw that the painter added quick lime to drum having water. Mukesh touched outer surface of drum, it is unbelievably hot. (a)write the chemical equation for above reaction. (b) What type of reaction is it? (C) What is utility of this reaction ?
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quick lime +water= slaked lime +heat
Cao+H2O=Ca(OH)2+ heat.combination reaction
1) Cao + H²O = Ca(OH)² + heat
2) Combination reaction
3) This reaction is exothermic reaction bcz it release energy in the form of heat so ,it is know as exothermic reaction.
CaO + 2H2O —- Ca(OH)2 + Heat
So it’s an Exothermic Reaction because heat is released and it is a Combination reaction
(A). Cao + H²O —> Ca(OH)²
(B). Exothermic Reaction
(C). ??
1) CaO+H2O =Ca(OH)2 + Heat
2) This exothermic combination reaction
3) This reaction is used in white washing of house