Question 6

MCQHARD

Correct statement(s) about the compounds P,QP, Q and RR is(are)

Xe(g)+F2(g)1:5 ratio873 K, 7 barPXe(g) + F_2(g) \xrightarrow[1 : 5 \text{ ratio}]{873 \text{ K, 7 bar}} P

P+O2F2143 KQ+O2P + O_2F_2 \xrightarrow{143 \text{ K}} Q + O_2

Q+H2Ocomplete hydrolysisR+HFQ + H_2O \xrightarrow{\text{complete hydrolysis}} R + HF

(A)

PP has two lone pairs of electrons on the central atom.

(B)

QQ has a perfect octahedral geometry.

(C)

QQ can act as a fluorinating agent.

(D)

The molecular structure of RR is trigonal pyramidal.

Detailed Solution

First, identify the compounds from the given reaction sequences:

  1. Xe+2F2(1:5 ratio)XeF4Xe + 2F_2 (1:5 \text{ ratio}) \rightarrow XeF_4. Thus, PP is XeF4XeF_4.
  2. XeF4+O2F2XeF6+O2XeF_4 + O_2F_2 \rightarrow XeF_6 + O_2. Thus, QQ is XeF6XeF_6.
  3. Complete hydrolysis of XeF6XeF_6: XeF6+3H2OXeO3+6HFXeF_6 + 3H_2O \rightarrow XeO_3 + 6HF. Thus, RR is XeO3XeO_3.

Now evaluate the options: (A) XeF4XeF_4 has 8 valence electrons from XeXe. It forms 4 sigma bonds with FF and has 2 lone pairs (sp3d2sp^3d^2 hybridization, square planar shape). Statement is correct. (B) XeF6XeF_6 has 6 bond pairs and 1 lone pair on XeXe. Its geometry is distorted octahedral, not perfect octahedral. Statement is incorrect. (C) XeF6XeF_6 is a very strong fluorinating agent (e.g., it can fluorinate silica). Statement is correct. (D) XeO3XeO_3 has XeXe forming 3 double bonds with Oxygen and possesses 1 lone pair (sp3sp^3 hybridization). Its molecular structure is trigonal pyramidal. Statement is correct.

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