Question

Which of the following molecular formulas represent the ore carnallite?
A) $N{a_2}A{l_2}{O_3}$
B) $N{a_3}Al{F_6}$
C) $KClMgC{l_2}.{\text{ }}6{H_2}O$
D) $F{e_3}{O_4}$

Answer 1

The periodic table plays a vital role in science. In the periodic table total of $118$ elements. In the periodic table there are a total of $18$ columns and $7$ rows. The columns are called groups. Hence, $18$ groups in the periodic table. The rows are called periods. Hence, a total of $7$ periods is in the table.

Complete answer:
The ore is the basic source of metal. By using an extraction process, the metal is obtained from ore.
Carnallite is one of the important ore for the industry to extract magnesium metal. In these magnesium metal is used for making Grignard reagents.
The chemical representation of carnallite ore is $KClMgC{l_2}.{\text{ }}6{H_2}O$. It contains the two metal atoms in chloride form and having hydrate in nature.
According to the above discussion, we conclude the molecular formula representing the ore carnallite is $KClMgC{l_2}.{\text{ }}6{H_2}O$.

Hence, the option C is the correct answer.

The atomic number of magnesium is$12$. It is one of the alkaline earth metals in the periodic table. It is present in the third period and second group in the periodic table. The symbol of magnesium is${\text{Mg}}$.

Note:
The atomic number of the element is nothing but the number of electrons or the number of protons. The mass number of the atom is the sum of the number of protons and the number of neutrons. Each and every element having a specific symbol in the periodic table. Each element having a specific position in the periodic table, that position is dependent on the physical and chemical properties of the element.