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Pure substance and mixture - class-VI

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Multiple Choice

In which of the following compounds resonance does not occur
(i) ${H _2}O$
(ii) $Si{O _2}$
(iii) $S{O _3}$
(iv) $C{O _2}$

  1. Both (i) and (iv)
  2. Both (i) and (ii)
  3. Both(iii) and (iv)
  4. (i),(ii)and(iv)
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