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What happens when SO2 gas is bubbled thr...

What happens when `SO_2` gas is bubbled through an aqueous solution of copper sulphate in the presence of potassium thiocyanate?

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`2CuSO_4+SO_2+2KCNS+2H_2Oto2CuCNSdarr+K_2SO_4+2H_2SO_4`
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