Question

Select non exist

• A. PH3
• B. PH4

Answer 1

Answer: (B)

PH4

Answer 2

The species PH4 (as a neutral molecule) does not exist. While PH3 (phosphine) is a stable molecule and PH4+ (phosphonium ion) is a stable ion, PH4 itself is an unstable radical and not a stable compound.