Which of the following ions has the largest ionic radius? MCQ with Answer and Explanation

Explanation:
Extensive properties depend on the amount of substance. Number of moles (or mass, volume) is extensive. Density, refractive index, boiling point are intensive properties – they do not depend on the quantity. For example, 1 liter of water boils at 100°C, same as 10 liters. Intensive properties are useful for identifying substances.

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:
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.