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किस क्रिया द्वारा `SO_2` अम्लीय `K_2Cr_2O_7` के विलयन के नारंगी रंग को बदलकर हरा कर देता है?

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किस क्रिया द्वारा `SO_2` अम्लीय `K_2Cr_2O_7` के विलयन के नारंगी रंग को बदलकर हरा कर देता है?
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`SO_2` अवकारक-जैसा कार्य करता है।
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