4. d and f- block elements — Chemistry STD 12 Science — Question

The direct reaction of xenon with fluorine leads to a series of compounds with oxidation numbers $+2,+4$ and $+6$ . XeF $4$ reacts violently with water to give $\mathrm{XeO}_3$. The compounds of xenon exhibit rich stereochemistry and their geometries can be deduced considering the total number of electron pairs in the valence shell.

$1.$ Argon is used in arc welding because of its

$(A)$ low reactivity with metal 

$(B)$ ability to lower the melting point of metal

$(C)$ flammability 

$(D)$ high calorific value

$2.$  The structure of $\mathrm{XeO}_3$ is

$(A)$ linear  $(B)$ planar  $(C)$ pyramidal  $(D)$ $T$-shaped

$3.$  $\mathrm{XeF}_4$ and $\mathrm{XeF}_6$ are expected to be

$(A)$ oxidizing  $(B)$ reducing  $(C)$ unreactive  $(D)$ strongly basic

Give the answer question $1,2$ and $3.$

Statement $I :$ The $E ^{\circ}$ value of $Ce ^{4+} / Ce ^{3+}$ is $+1.74 \,V$

Statement $II :$ $Ce$ is more stable in $Ce ^{4+}$ state than $Ce ^{3+}$ state.

In the light of the above statements, choose the most appropriate answer from the options given below