Question

On moving from left to right in a period what is the order of acidic character of hydrides?

• A. $N{H}_3<H_{2}O<HF$
• B. $HF<H_{2}O<N{H}_3$
• C. $H_{2}O<HF<N{H}_3$
• D. $H_{2}O<N{H}_3<HF$

Answer 1

The correct option is A $N{H}_3<H_{2}O<HF$

On moving from left to right in a period, the acidic character of hydrides increases. $N{H}_3$ is basic, $H_{2}O$ is neutral and $HF$ is acidic.

Electronegativity increases from left to right in a period. The ease of losing a proton increases and acidity increases. Acidity is the ability to donate a proton.