Question

Arrange ${NH}_4^{+},H_{2}O,H_3{O}^{+},HF$ and ${OH}^{-}$ in increasing order of acidic nature.

• A. ${OH}^{-}<H_{2}O<{NH}_4^{+}<HF<H_3{O}^{+}$
• B. $H_3{O}^{+}>HF>H_{2}O>{NH}_4^{+}>{OH}^{-}$
• C. ${NH}_4^{+}<HF<H_3{O}^{+}<H_{2}O<{OH}^{-}$
• D. $H_3{O}^{+}<{NH}_4^{+}<HF<{OH}^{-}<H_{2}O$

Answer 1

The correct option is A ${OH}^{-}<H_{2}O<{NH}_4^{+}<HF<H_3{O}^{+}$

Acids are the species who have tendency to give hydrogen ion

So order of acidity is

${OH}^{-}<H_{2}O<{NH}_4^{+}<HF<H_3{O}^{+}$
base neutral weak strong strong

acid acid acid