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2CuSO4 + 4KI = 2K2SO4 + Cu2I+I2
2CuSO4 +K4[Fe(CN)6]=Cu[Fe(CN)6] + K2SO4
5Cu+2HNO3 = 5CuO+N2+H2SO4
CuSO4+H2S = CuS+H2+SO4
ANS : 2
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