Question

Which of the following statements is not correct regarding standard electrode potential?

If E^o > 0 for an electrode, its reduced form is stable than H2 gas.
E^o for lithium is lowest, indicating lithium ion is the weakest oxidising agent.
E^o <0 for an electrode, H2 (g) is more stable than the reduced form of electrode.
E^o for fluorine is the highest, indicating fluoride ion is the strongest reducing agent.

Answer 1

Pressure at a depth h below the surface of water=atmospheric pressure + pressure due to water column of height h.If atmospheric pressure is P, then 2P=P + hρg or hρg = PBut P=10 N cm–2=l0N/(10–2 m)2=105 N m–2Hence h=P/ρg=105/(103 × 9.8)=10.2 mThus a water column of height 10.2 m exerts a pressure equal to the atmospheric pressure.