question_answer 1)

  In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each questions. (a) A and R both are true and R is the correct explanation of A. (b) A and R both are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A and R both are false. Assertion (A): Increasing order of acidity of hydrogen halides is\[HF<HCl<HBr<HI\]. Reason (R): While comparing acids formed by the elements belonging to the same group of periodic table, H-A bond strength is a more important factor in determining acidity of an acid than the polar nature of the bond.

Answer:

(a) \[\frac{H-F<H-Cl<H-Br<H-I}{Increasing\text{ }acidic\text{ }character}\] Weaker is the covalent bond, stronger is the acidic character