Question

define
substance oxidised
substance reduced
oxidising agent
reducing agent

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in english and in simple language with example

Answer 1

substance oxidised means oxygen is added or hydrogen is removed from it.
substance reduced means oxygen is removed or hydrogen is added to it.
oxidizing agent is a substance that tends to bring about oxidation by being reduced and gaining electrons.
reducing agent  (also called a reductant or reducer) is an element (such as calcium) or compound that loses (or "donates") an electron to another chemical species in a redox chemical reaction.
example. Ca+O2---->CaO
it's a oxidizing reaction calcium is being oxidised.