Electrostatics

Concept: Chemistry - Fuel Cells and Catalysts.
Step 1: Understand role of electrode metal. In fuel cells, certain metals are coated on electrodes to act as catalysts and speed up oxidation-reduction reactions.
Step 2: Identify suitable catalyst metal. Transition/noble metals like platinum and palladium are commonly used because they adsorb gases like hydrogen and enhance reaction rate.
Step 3: Choose correct option. Among given options, Palladium is the correct catalytic metal.
Step 4: Final answer. [ \boxed{\text{Palladium}} ]
Hence, correct option is (C).

Concept: Chemistry - Faraday’s Law of Electrolysis.
Step 1: Electrons required. Reaction: [ O_2+4H^++4e^- \rightarrow 2H_2O ] 1 mole of requires: [ 4 \text{ moles of electrons} ]
Step 2: Charge of 1 mole electrons. 1 mole electrons = 1 Faraday [ 1F=96500\text{ C} ]
Step 3: Total charge required. [ Q=4F=4\times96500 ] [ Q=386000\text{ C} ]
Step 4: Final answer. [ \boxed{386000\text{ Coulombs}} ]
Hence, correct option is (A).