1. Assertion (A): Calcium carbonate on heating gives calcium oxide and water.
Reason (R): On heating calcium carbonate, decomposition reaction takes place.
a) both (A) and (R )are true and R is the correct explanation of the assertion.
b) both (A ) and (R ) are true, but R is not the correct explanation of the assertion.
c) (A) is true, but (R) is false.
d) (A) is false, but (R) is true.
2. Assertion (A): Quick lime reacts vigorously with water releasing a large amount of heat.
Reason (R): The above chemical reaction is an exothermic reaction.
a) both (A) and (R )are true and R is the correct explanation of the assertion.
b) both (A ) and (R ) are true, but R is not the correct explanation of the assertion.
c) (A) is true, but (R) is false.
d) (A) is false, but (R) is true.
Answers
d is your answer because caco3 by decomposition process gives cao + co2
hope you got it
Answer:
1. (A) is false, but (R) is true.
2. Both (A) and (R )are true and R is the correct explanation of the assertion.
Explanation:
1. Calcium carbonate on heating gets decomposed at about 1200 K to give lime(CaO) and carbon dioxide.
The reaction is as follows.
CaCO₃ → CaO + CO₂
A decomposition reaction is a reaction in which the reactant breaks down to give two or more products. The heating of CaCO₃ is an example of a decomposition reaction.
(A) is false, but (R) is true.
2. Quick lime is Calcium oxide(CaO). When exposed to the atmosphere, calcium oxide absorbs moisture to give calcium hydroxide (Ca(OH)₂).
The reaction is as shown below.
CaO + H₂O → Ca(OH)₂ ΔH = -64.5 kJ/mol
During the reaction, a large amount of heat is given out. Such a reaction is called an exothermic reaction.
Both (A) and (R )are true and R is the correct explanation of the assertion.