Question

Assertion (A): Among the two \[\ce{O - H}\] bonds in \[\ce{H2O}\] molecule, the energy required to break the first \[\ce{O - H}\] bond and the other \[\ce{O - H}\] bond is the same.

Reason (R): This is because the electronic environment around oxygen is the same even after breakage of one \[\ce{O - H}\] bond.

विकल्प

• A and R both are correct, and R is correct explanation of A.

• A and R both are correct, but R is not the correct explanation of A.

• A is true but R is false.

• A and R both are false.

Answer 1

A and R both are false.

Explanation:

The energy required to break the first \[\ce{O - H}\] bond is not same than that of the second \[\ce{O - H}\] bond in water molecule, that means the bond enthalpies of the two \[\ce{O - H}\] are different. This is because the electronic environment around the oxygen atom in water molecules is not the same even after the \[\ce{O - H}\] bond breaks.