Which is the strongest binary acid among H₂Te, H₂Se, H₃As and H₃Sb? Which is the weakest? Why?

• A. The strongest acid is H₃Sb and the weakest acid is H₂Se because the acid strength for a binary acid (HX) increases with electronegativity of X and size of X.
• B. The strongest acid is H₂Te and the weakest acid is H₃As because the acid strength for a binary acid (HX) increases with electronegativity of X and size of X.
• C. The strongest acid is H₃As and the weakest acid is H₂Te because the acid strength for a binary acid (HX) decreases with electronegativity of X and size of X.
• D. The strongest acid is H₂Se and the weakest acid is H₃Sb because the acid strength for a binary acid (HX) decreases with electronegativity of X and size of X.

Answer: (B)