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  • In the following question, a statement of assertion is followed by a statement of reason. Mark the correct choice as: Assertion:The stability of HF, HCl, HBr an

In the following question, a statement of assertion is followed by a statement of reason. Mark the correct choice as:

Assertion:The stability of HF, HCl, HBr and HI decreases down the group.

Reason:Bond dissociation enthalpy increases in the order:H-F<H-Cl<H-Br<H-I

Option: 1

Both assertion and reason are true and reason is the correct explanation of assertion.


Option: 2

Both assertion and reason are true but reason is not the correct explanation of assertion.


Option: 3

Assertion is true but reason is false.


Option: 4

Both assertion and reason is false.


Answers (1)

The stability of these halides HF, HCl, HBr and HI decreases down the group due to decrease in bond (H-X) dissociation enthalpy which means the requirement of energy to dissociate one single chemical bond which is in the order of: H-F> H-Cl> H-Br> H-I.

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Sumit Saini

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