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Blood darkens if hydrogen sulfide enters...

Blood darkens if hydrogen sulfide enters it. Why?

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PATHFINDER-HALOALKANES AND HALOARENES-QUESTION BANK
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  3. Blood darkens if hydrogen sulfide enters it. Why?

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  4. Why pure HI solution in a bottle acquires brown colour after sometime?

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  13. Why ozone is thermodynamically less stable than oxygen?

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  15. Give the structure of the nucleophile that could be used to convert et...

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