JEE PYQ: P Block Elements Question 41
Question 41 - 2020 (08 Jan Shift 2)
White phosphorus on reaction with concentrated NaOH solution in an inert atmosphere of $\text{CO}_2$ gives phosphine and compound ($X$). ($X$) on acidification with HCl gives compound ($Y$). The basicity of compound ($Y$) is:
(1) 2
(2) 1
(3) 4
(4) 3
Show Answer
Answer: (2)
Solution
$\text{P}_4 + 3\text{NaOH} + 3\text{H}_2\text{O} \to \text{PH}_3 + 3\text{NaH}_2\text{PO}_2$ (X). $\text{NaH}_2\text{PO}_2 \xrightarrow{\text{HCl}} \text{H}_3\text{PO}_2$ (Y). Basicity of $\text{H}_3\text{PO}_2 = 1$.
BETA
