Surface Chemistry - Result Question 13
####13. Haemoglobin and gold sol are examples of
(2019 Main, 10 Jan II)
(a) negatively and positively charged sols, respectively
(b) negatively charged sols
(c) positively charged sols
(d) positively and negatively charged sols, respectively
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Answer:
Correct Answer: 13. (c)
Solution:
- Haemoglobin and gold sol both are colloids and always carry an electric charge. Haemoglobin is a positively charged sol, because in haemoglobin, $Fe^{2+}$ ion is the central metal ion of the octahedral complex.
All metal sols like, Au-sol, Ag-sol etc; are negatively charged sols.
