TS EAMCET · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Which among the following is the strongest acid?

A HF
B $\mathrm{HCl}$
C $\mathrm{HBr}$
D $\mathrm{HI}$

Verified Solution

Answer & Solution

Correct Answer

(D) $\mathrm{HI}$

Step-by-step Solution

Detailed explanation

Among hydrogen halides the strongest acids is HI. As the size of halogen increase, bond length increase hence bond energy decreases. So, the $\mathrm{HI}$ releases $\mathrm{H}^{\oplus}$ ions easily and show high acidic nature.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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From TS EAMCET

Match the following

	Column-1 Compound/ reagent		Column-2 Other name / Chemical / Name of the process
A	Methanol	I	Lucas reagent
B	${ZnCl}_{2} / Conc . HCl$	II	Baeyer's reagent
C	Rectified spirit	III	Wood spirit
D	Dil. ${KMnO}_{4}$	IV	$95 % C_{2} H_{5} OH$
		V	$75 % C_{2} H_{5} OH$
		VI	$90 % C_{3} H_{7} OH$

The correct match is

TS EAMCET 2021 Hard

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