2021 The p-Block Elements (Group 15 to 18)Group 17 Elements – Hydrogen Halides Medium Question 5 of 11 in The p-Block Elements (Group 15 to 18)

Statement-I: Acid strength increases in the order given as HF << HCl << HBr << HI. Statement-II: As the size of the elements F, Cl, Br, I increases down the group, the bond strength of HF, HCl, HBr and HI decreases and so the acid strength increases. In the light of the above statements, choose the correct answer from the options given below.

A Both statement I and statement II are false
B Statement I is correct but statement II is false
C Statement I is incorrect but statement II is true
D Both statement I and statement II are true

The answer is D.

Solution

H–F (1s–2p), H–Cl (1s–3p), H–Br (1s–4p), H–I (1s–5p) Down the group, the size of the halogen increases, orbital overlap decreases, bond strength decreases, and so the acidic strength increases: HF << HCl << HBr << HI. So both statements are true.

Concept acid strength of hydrogen halides

The p-Block Elements (Group 15 to 18) in past papers

11 questions from this chapter have appeared across 5 exam years.