Which substance or solution conducts electricity best or least

This type of question, asked 4 times: 10 May 2023 S1, 9 May 2024 S2, 13 Apr 2026 S2, 19 Apr 2026 S2. All 4 questions below, oldest first.

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Question 1
10 May 2023 S1
100 $Which of the following substances conducts electricity?$
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Question 2
9 May 2024 S2
81 $Which from the following compound solutions in water of equal concentration has electrical conductivity nearly same as distilled water?$
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Question 3
13 Apr 2026 S2
26 $Which of the following solutions will have the highest electrical conductivity?$
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Question 4
19 Apr 2026 S2
13 $Which of the following equimolar solutions is the best conductor of electricity at same temperature ?$
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Question 1