\( 20 \mathrm{ml} \) of \( \mathrm{O}_{2} \) contracts to \( 17 \mathrm{ml} \) when subjected to...

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\( 20 \mathrm{ml} \) of \( \mathrm{O}_{2} \) contracts to \( 17 \mathrm{ml} \) when subjected to silent electric discharge in an ozoniser. What further contraction would be observed if the partially ozonised oxygen is treated with oil of cinnamon (which absorbs ozone). All volumes are reported at the same temperature and pressure.
(a) \( 2 \mathrm{ml} \)
(b) \( 8 \mathrm{ml} \)
(c) \( 6 \mathrm{ml} \)
(d) \( 4 \mathrm{ml} \)
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