Identify the positively charged sol (haemoglobin)

The same question, asked 3 times: 16 May 2023 S2, 20 Apr 2025 S1, 19 May 2026 S1. Every wording below, oldest first.

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Question 1
16 May 2023 S2
87 $Identify positively charged sol from the following.$
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Question 2
20 Apr 2025 S1
84 $Which of the following is not negatively charged sol?$
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Question 3
19 May 2026 S1
34 $Identify a positively charged sol from the following.$
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