Home › Maharashtra SSC (Class 10) › Chemistry › Chemical Reactions and Equations › Consider the reaction CaCO$_3$(s) + heat $\longr…
Consider the reaction CaCO$_3$(s) + heat $\longrightarrow$ CaO(s) + CO$_2$(g). Heat must be supplied for it to proceed. This reaction is:
Aendothermic
Ba displacement reaction
Cexothermic
Da combination reaction
Answer & Solution
Correct answer: A. endothermic
1. The equation shows 'heat' on the reactant side, meaning heat is taken in.
2. A reaction that absorbs or requires heat to proceed is endothermic.
3. An exothermic reaction would show heat released on the product side, the opposite.
4. It is a decomposition (one reactant to two products), not displacement or combination, so those options are wrong.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 3 "Chemical Reactions and Equations", p.48_
Related questions
Clear limewater turns milky white when a gas is bubbled through it. Which gas was in the bMilk left standing for a few days tastes sour. Which process has produced that taste?During a chemical reaction, what happens to the atoms of the reactants?What do we call the substances that are present before a reaction takes place?What happens to the starting substances during a chemical reaction?A reducing agent in a redox reaction is the substance thatRespiration, in which glucose combines with oxygen to release energy, is best described asThe decomposition of water into hydrogen and oxygen on passing electric current is called