MCQ
An oxidising agent is a substance, which
- AAccept proton
- ✓Accept electron
- CAccept neutron
- DDonate electron
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| $List-I$ | $List-II$ |
| ($P$) $XeF _2$ | ($1$) Trigonal bipyramidal and two lone pair of electrons |
| ($Q$) $XeF _4$ | ($2$) Tetrahedral and one lone pair of electrons |
| ($R$) $XeO _3$ | ($3$) Octahedral and two lone pair of electrons |
| ($S$) $XeO _3 F _2$ | ($4$) Trigonal bipyramidal and no lone pair of electrons |
| ($5$) Trigonal bipyramidal and three lone pair of electrons |
| column $I$ | column $II$ |
| $(A)$ $CO _2( s ) \rightarrow CO _2( g )$ | $(p)$ phase transition |
| $(B)$ $CaCO _3( s ) \rightarrow CaO$ (s) $+ CO _2( g )$ | $(q)$ allotropic change |
| $(C)$ $2 H \bullet \rightarrow H _2( g )$ | $(r)$ $\Delta H$ is positive |
| $(D)$ $P_{\text {(white, solid) }} \rightarrow P_{\text {(red, solid) }}$ | $(s)$ $\Delta S$ is positive |
| $(t)$ $\Delta S$ is negative |
The number of compounds/species which obey Huckel's rule is $..........$