Question

The set of elements which can form electron rich hydrides is

• A. B, N, O
• B. N, O, F
• C. C, Si, N
• D. Be, B, C

Hint:

Hydrides are classified as \[ \boxed{ \begin{aligned} &\text{Electron-deficient: } \mathrm{BH_3}, &\text{Electron-precise: } \mathrm{CH_4}, &\text{Electron-rich: } \mathrm{NH_3,\ H_2O,\ HF}. \end{aligned} } \]

Answer 1

The Correct Option is B

Step 1: Recall the definition of electron-rich hydrides. Electron-rich hydrides possess one or more lone pairs of electrons on the central atom. These are generally formed by highly electronegative \(p\)-block elements.

Step 2: Examine the given elements. The hydrides formed are \[ \mathrm{NH_3,\ H_2O,\ HF}. \] These molecules contain lone pairs on the central atom and are therefore electron-rich hydrides.

Step 3: Choose the correct set. Hence, the required set is \[ \boxed{\mathrm{N,\ O,\ F}.} \] Therefore, the correct option is \(\boxed{(B)}\).