For two statements are given-one labelled Assertion (A) and the o… - Vidyadip

MCQ

For two statements are given$-$one labelled Assertion $(A)$ and the other labelled
Reason $(R)$. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below:
Assertion: When calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide.
Reason: The decomposition reaction takes place on application of heat, therefore, it is an endothermic reaction.

A
Both $A$ and $R$ are true, and $R$ is correct explanation of the assertion.
✓
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.

✓

Answer

Correct option: B.

Both $A$ and $R$ are true, but $R$ is not the correct explanation of the assertion.

$\ce{CaCO_3}$ on heating gives $\ce{CO_2}$ and $\ce{CaO.}$

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