Use of which of the following solvent in dry cleaning will result in less harm to ground water ?...

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Use of which of the following solvent in dry cleaning will result in less harm to ground water ?
(a) \( \mathrm{Cl}_{2} \mathrm{C}=\mathrm{CCl}_{2} \)
(b) Liquid \( \mathrm{CO}_{2} \)
(c) \( \mathrm{H}_{2} \mathrm{O}_{2} \)
(d) None of these
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