Question

Select the correct order(s) of acidic/basic strength :

• A. NaOH< Mg(OH)2 < Al(OH)3 ; basic strength
• B. H2S > H2Se > H2Te ; acidic strength
• C. H2SO3 < H2SO4 ; acidic strength
• D. Both (2) and (3)

Answer 1

Answer: (C)

H2SO3 < H2SO4 ; acidic strength

Answer 2

H2S < H2Se < H2Te (on moving top to bottom, bond

dissociation energy decreases, so acidic strength increases).

In case of oxyacids of same element, higher is the oxidation state of the central atom, greater is the acidity.

Hence, H2SO4 is a stronger acid than H2SO3