A mixture of sand and iodine can be separated by: MCQ with Answer and Explanation

Explanation:
Standard reduction potential (E°) measures the tendency of a species to gain electrons and be reduced. The more positive the E°, the greater the tendency to undergo reduction. Metals with negative E° are good reducing agents (e.g., Zn, -0.76 V). E°cell = E°cathode - E°anode. It is measured under standard conditions (1 M, 1 atm, 25°C) relative to standard hydrogen electrode (SHE) which is assigned 0 V.

Explanation:
Extensive properties depend on the amount of substance. Enthalpy (heat content) is extensive because it scales with the quantity. Temperature, density, and refractive index are intensive properties; they remain constant regardless of the sample size. For example, 1 kg of water has more enthalpy than 1 g of water at the same temperature.

Explanation:
Ethanol (C₂H₅OH) is the intoxicating ingredient in beer, wine, spirits. Methanol is toxic. Propanol and butanol are used as solvents, not beverages.