Above question is incomplete. Complete question is: <span>Which 0.1-molar aqueous solution is the best conductor of electricity? (1) H2S (2) H2SO4 (3)HF (4)H3PO4? ...........................................................................................................................
Answer: Correct answer is option 4, i.e. H3PO4.
Reason: Each molecule of H3PO4 on dissociation will generate 4 ions (three H+ ions and one PO4 3-ion). On other hand, H2SO4 and HF will generate three and two ions respectively. H2S is a covalent compound, and will not generate any ions in solution. Due to largest number of ions, 0.1 M H3PO4 solution will have maximum conductivity. Hence, it will be the best conductor of electricity.
Day and night are due to the Earth rotating on its axis, not its orbiting around the sun. The term 'one day' is determined by the time the Earth takes to rotate once on its axis and includes both day time and night time.
