Question

Statement 1: Exothermic reactions absorb heat.
Statement 2: Breaking covalent bonds always requires energy.
A. Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.
B. Both Statement 1 and Statement 2 are correct, but Statement 2 is not the correct explanation of Statement 1.
C. Statement 1 is correct, but Statement 2 is not correct .
D. Statement 1 is not correct, but Statement 2 is correct.

Answer 1

Hint:To answer this question we need to have knowledge about exothermic and endothermic reactions. Exothermic reactions are exactly opposite of endothermic reactions in terms of heat. Covalent bonds bond non-metal atoms with each other by sharing electron pairs between those atoms. And these atoms require energy to be held together. With this information, determine the correct answer.

Complete answer:We are given two statements and we have to find whether these statements are true or not.
In the first statement, it is given that exothermic reactions absorb heat.
But actually exothermic reactions release heat and endothermic reactions absorb heat. Exothermic reactions have negative enthalpy change whereas endothermic reactions have positive enthalpy change.
So the first statement is incorrect.
In the second statement, it is given that to break covalent bonds we always require energy.
Covalent bonds are formed between atoms by sharing electron pairs between them. So while making every covalent bond, energy is added to hold the atoms together to form the molecules. So to break covalent bonds, we always require energy and this must be equal to the energy which was required to make the bond.
So, yes, the second statement is correct.

As the given 1st statement is not correct and the 2nd statement is correct, the correct option is Option D.

Note:First statement can be considered as an assertion and second statement can be considered as a reason. Assertion is a particular statement and reason is the explanation about that particular statement. You have to find out whether each statement is correct or not. If both the statements are correct, you have to find out whether the reason supports the assertion or not. Do not confuse in answering these types of questions. Be careful with ionic bonds and covalent bonds.