Redox Reactions Test - 7

(3d²4s²) is the configuration of transition element which shows variable oxidation state.

Anode is where oxidation occurs means species that undergo reaction at anode should have negative electrode potential (reduction). A large negative value (e.g. Al/Al³⁺ E⁰ = -1.66) means that the element or compound ionises easily, in other words, it releases electrons easily. This element or compound is easily oxidised and is therefore a good reducing agent.

The electron releasing tendency of the metals, zinc, copper and silver is in the order Zn>Cu>Ag

This is according to the metal activity series or electrochemical series.

Zn→ Zn²⁺ and H------> H₂, it means that Zn was oxidized since it lost electrons, and H was reduced since it gained electrons. (Cl is a spectator ion here as its oxidation state does not change).
So then by definition, Zn is the reducing agent and H is the oxidizing agent (Oxidant).

Oils are esters of unsaturated fatty acids whereas Dalda is ester of saturated fatty acids. The former are converted into the latter by catalytic hydrogenation i.e., reduction.

For any salt or solution to exhibit any colour, the central atom of the compound should have at least an unpaired d electron in it.This unpaired d electron is responsible for its colour in the solutions and salts.