Tag: evs - i

Stalactites is a type of mineral. It has the following properties. It is layer like mineral, very thin and deposits having finger like shape hanging from caves.

Minerals are natural elements or compounds occur in earth's crust whereas over are those, which are extracted from minerals without economic loss.

A mineral is known as the ore of a metal if the metal can be produced from it profitably. There can be many minerals of a metal but the ones which undergo purification are known as ores.

Minerals are natural elements or compounds occurs in earth's crust where as ores are those, which are extracted from minerals without economic loss.

Haematite is $Fe _2O _3$, magnetite is $Fe _3O _4$ and Magnesite is $MgCO _3$.
$\therefore$ Magnesite is not ore of iron.

All minerals doesn't have objectionable impurities. All minerals are not ores. All ores are minerals. All minerals are not used to extract metals. Only ores are used to extract metals.

It is also called as the bucky ball. It is spherical in shape with the formula $C _{60}$. It has a cage like fused ring structure which resembles a football. Buckminster fullerene is the most commonly occurring fullerene molecule.

$\displaystyle Calamine$ $\displaystyle ZnCO _3$ is the mineral of zinc.
Hence, option (D) is correct answer.
 
$\displaystyle Magnetite$ $\displaystyle Fe _3O _4$ is iron mineral.

$\displaystyle Malachite $ $\displaystyle Cu _2CO _3(OH) _2$ is mineral of copper.

$\displaystyle Bauxite$ $\displaystyle Al _2O _3 \cdot 2H _2O$ is ore of aluminum.

Deep Sea mining is relatively unconventional method of extracting Rare Earth Elements (REE). It is an effective way to obtain a large amounts of rare earth metals. Minerals mined are- $Ag,Au,Cu,Mn,Co$ and $Zn$, etc.

Solution:- (D) Bauxite