Lead-acid batteries use dilute H₂SO₄ as electrolyte. The electrodes are Pb and PbO₂. During discharge, both plates form PbSO₄ and the acid concentration decreases. Recharging reverses the reaction.
Explanation:
Teflon is polytetrafluoroethylene (PTFE), a fluorocarbon polymer with extremely low coefficient of friction and high thermal stability, making it ideal for non-stick cookware. PVC (polyvinyl chloride) is used in pipes and cables. Polystyrene is used in packaging and insulation. Nylon is a polyamide used in textiles. Teflon is chemically inert and resistant to acids and bases.
Consider the following statements: 1. Galvanization involves coating iron with zinc. 2. Sacrificial protection uses a more reactive metal to protect iron. Which is/are correct?
Explanation:
Galvanization is the process of applying a protective zinc coating to iron to prevent rusting. Sacrificial protection (or cathodic protection) involves connecting iron to a more reactive metal (like magnesium or zinc). The more reactive metal oxidizes preferentially, sacrificing itself to protect the iron. Both statements are correct.
Explanation:
Combination: two or more reactants combine to one product. Mg and O₂ combine to form MgO. A is decomposition; B is displacement; D is double displacement.
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