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The haemoglobin and the gold sol are examples of
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positively and negatively charged sols, respectively.
Hemoglobin and gold sol both are colloids and always carry an electric charge. Hemoglobin is a positively charged sol, because in hemoglobin, ion is the central metal ion of the octahedral complex. All metal sols like, Au-sol, Ag-sol etc. are negatively charged sols
The gold sol is negatively charged, while the haemoglobin is positively charged.
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