Question

Which of the following pair is/are correct :
(i) Malachite Copper
(ii) Cinnabar Mercury
(iii) Galena Lead
(iv) All of these

Answer 1

Ore is a type of natural rock or silt that includes one or more precious minerals, usually metals, that may be mined, processed, and sold for profit. Mining extracts ore from the earth, which is then processed or refined, usually by smelting, to remove the precious metals or minerals. The concentration of the desired ingredient in an ore is determined by its grade. To establish if a rock is of sufficiently high quality to be worth mining and thus termed an ore, the value of the metals or minerals it contains must be balanced against the cost of extraction.

Complete answer:
Malachite has the formula $~C{{u}_{2}}C{{O}_{3}}{{\left( OH \right)}_{2}}$ and is a copper carbonate hydroxide mineral. In fractures and deep subterranean areas where the water table and hydrothermal fluids offer the conditions for chemical precipitation, this opaque, green-banded mineral crystallises in the monoclinic crystal system and most frequently forms botryoidal, fibrous, or stalagmitic masses. Individual crystals are uncommon, although thin to acicular prisms do exist. Pseudomorphs form after azurite crystals that are more tabular or blocky.
The vivid crimson to brick-red form of mercury(II) sulphide is cinnabar (HgS). It is the most common ore for refining elemental mercury, and it was formerly the source of vermilion, a vivid red or scarlet colour, and other red mercury paints. Cinnabar is a vein-filling mineral found in the vicinity of recent volcanic activity and alkaline hot springs.
Galena, commonly known as lead glance, is a naturally occurring lead(II) sulphide mineral (PbS). It is the most important lead ore and a significant silver source. Galena is a sulphide mineral that is plentiful and widely dispersed. It crystallises as octahedral forms in the cubic crystal system. Sphalerite, calcite, and fluorite are frequently found together.
Hence all options are correct

Hence option (iv) is correct.

Note:
An ore deposit is a substantial collection of minerals within a host rock that is commercially valuable. This is not the same as a mineral resource as described by the categorization criteria for mineral resources. A single occurrence of a specific ore type is referred to as an ore deposit. In most situations, an ore is made up of a mixture of precious minerals as well as undesirable or worthless rocks and minerals. Gangue is the portion of an ore that is not commercially attractive but cannot be avoided in mining. Mineral processing, often known as ore dressing, is the process of separating rich ore minerals from gangue minerals using froth flotation, gravity concentration, and other techniques.