Which of the following may act as both an oxi | vedclass

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(B) substance can act as both an oxidizing and a reducing agent if the central atom is in an intermediate oxidation state.$K_2Cr_2O_7$: Chromium is in

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$SO_2$

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(B) substance can act as both an oxidizing and a reducing agent if the central atom is in an intermediate oxidation state.$K_2Cr_2O_7$: Chromium is in its highest oxidation state $(+6)$,so it acts only as an oxidizing agent.$SO_2$: Sulphur is in the $+4$ oxidation state. Since the range of oxidation states for sulphur is $-2$ to $+6$,it can be oxidized to $+6$ (reducing agent) or reduced to lower states (oxidizing agent).$H_2S$: Sulphur is in its lowest oxidation state $(-2)$,so it acts only as a reducing agent.$NH_3$: Nitrogen is in its lowest oxidation state $(-3)$,so it acts only as a reducing agent.

Which of the following may act as both an oxidising and a reducing agent?

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