In the thermite reaction, aluminum is used to reduce: MCQ with Answer and Explanation

Explanation:
Salt (NaCl) dissolved in water increases the electrical conductivity of the electrolyte, facilitating the electrochemical corrosion process. This is why iron rusts faster in coastal areas and on roads treated with deicing salts. Dry air prevents rusting (needs moisture). Coating with paint blocks oxygen and moisture. Vacuum has no oxygen.

Explanation:
The Chlor-alkali process involves the electrolysis of aqueous NaCl (brine). It produces sodium hydroxide (NaOH) at the cathode, chlorine gas (Cl₂) at the anode, and hydrogen gas (H₂) at the cathode. The Solvay process produces sodium carbonate, not sodium hydroxide.

Explanation:
An amalgam is an alloy of mercury with another metal. For example, sodium amalgam (used as reducing agent), zinc amalgam (for Clemmensen reduction), and dental amalgam (mercury-silver-tin-copper). Most metals dissolve in mercury, forming amalgams, except iron and platinum. Amalgams can be liquid or solid depending on proportion. Used in gold extraction.