In four of the following groups, the three

Question

substances are either all strong electrolytes, all weak electrolytes, or all nonelectrolytes. Which group has one member which is NOT like the others in the group?

1. NaCl; Ca(OH)2; HNO3
2. BaCl2; NaNO3; HF
3. O2; CO(NH2)2; CH3OH
4. NH3; CH3COOH; HCN
5. H2SO4; NaOH; HCl

Answer 1

I would choose 2.

1. all strong electrolytes.
2. BaCl2 and NaNO3 are strong but HF is weak.
3. all non-elecrolytes.
4. all weak electrolytes.
5. all strong electrolytes.