Paper: CSIR-NET June 2018 · Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Phosphazenes Sn Compounds · Marks: 2 · Difficulty: Medium
A binary fluoride ( Z ) of xenon combines with two moles of NaF to give a product which on hearting to $100^{\circ} \mathrm{C}$ affords compounds A . the alkaline hydrolysis of A gives perxenate salt. Z and A are, respectively,
(a)$\mathrm{XeF}_{2}$ and $\mathrm{XeF}_{4}$
(b)$\mathrm{XeF}_{4}$ and $\mathrm{XeF}_{6}$
(c)$\mathrm{XeF}_{6}$ and $\mathrm{XeF}_{4}$
(d)$\mathrm{XeF}_{6}$ and $\mathrm{XeF}_{6}$ 9
Answer
Answer: D ✓ checked by 4AB · confidence medium
Explanation
XeF₆ + 2NaF → Na₂XeF₈; heating to 100 °C regenerates XeF₆ (A). Alkaline hydrolysis of XeF₆ gives xenate, which disproportionates to perxenate. Z = A = XeF₆.