- ALoss of electrons
- ✓Gain of electrons
- CIncrease in the valency of positive part
- DDecrease in the valency of negative part
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| Column $I$ | Column $II$ |
| $(A)$ Freezing of water at $273 K$ and $1 \ atm$ | $(P)$ $q =0$ |
| $(B)$ Expansion of $1 \ mol$ of an ideal gas into a vacuum under isolated conditions | $(Q)$ $w=0$ |
| $(C)$ Mixing of equal volumes of two ideal gases at constant temperature and pressure in an isolated container | $(R)$ $\Delta S _{\text {sy5 }} < 0$ |
| $(D)$ Reversible heating of $H _2( g )$ at $1 \ atm$ from $300 \ K$ to $600 \ K$, followed by reversible cooling to $300 \ K$ at $1 \ atm$ | $(S)$ $\Delta U =0$ |
| $(T)$ $\Delta G =0$ |
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 $3.$