All ores are minerals , but all minerals are not ores. Why ?

Assertion (A): A mineral is called ore, when metal is extracted from it conveniently and economically. Reason (R): All ores are minerals but all minerals are not ores.

(a) All ores are minerals but all minerals are not ores. Justify. (b) An iron knife kept in blue copper sulphate solution turns the blue solution into light green. Explain. (c ) An athlete won a bronze medal in a race competition. After some days, he found that the medal had lost its lustre due to the formation of a greenish layer on it. Name the metals present in the medal. What is the reason for the formation of a greenish layer on its surface ?

Statement-1: All ores are minaerals but all minerals are not ores. Statement-2: Minerals are obtained from mines.

All ores are minerals while all minerals are not ores because :

A mineral is called an ore if :

Which of the following statements is/are true? A. Out of 124 elements, 22 are non-metals, and other are metals. B. Every ore is a mineral but every mineral is not an ore.