Question

Which of the following contains both $Mg$ and $Ca$ ?
 A.Magnesite
 B.Calamine
 C.Carnalite
 D.Dolomite

Answer 1

Hint: We have to know that, chemical composition alludes to the game plan, type, and proportion of iotas in particles of synthetic substances. The sub-atomic mass of a substance is the amount of the normal masses of the atoms in a single particle of a substance. Computations for equation mass and sub-atomic mass are portrayed.

Complete answer:
For Magnesite,
We have to know that magnesite is a magnesium carbonate mineral with a compound creation of $MgC{O_3}$ . It is named after the presence of magnesium in its organization.
Therefore, option (A) magnesite is incorrect. Because only magnesium is present, calcium cannot be present in magnesite compounds.
For Calamine,
We have to know that, calamine is Zinc Oxide with a little extent of ferric oxide. It is utilized in moisturizer structure to treat skin issues or creepy crawly chomps that cause tingling or some other skin issues.
Therefore, option (B) is incorrect. Where, both the magnesium, and calcium cannot be present in the calamine compound.
For Carnallite,
We have to know that, a mineral consisting of hydrous potassium-magnesium chloride that is a significant wellspring of potassium. The chemical formula for the carnalite is
$KCl.MgC{l_2}.6{H_2}O$ .Here, only magnesium compound is present, calcium cannot be present in the carnallite compound.
Therefore, option (C) is incorrect.
For Dolomite,
We have to know that, Dolomite is an anhydrous carbonate mineral made out of calcium magnesium carbonate, in a perfect world $CaMg{(C{O_3})_2}$ . Here, both the magnesium and calcium are present.

Therefore, option (D) is correct.

Note:
We have to know that, Dolomite is utilized as a wellspring of magnesia ( $MgO$ ), a feed added substance for domesticated animals, a sintering specialist and transition in metal handling, and as a fixing in the creation of glass, blocks, and ceramics. Dolomite fills in as the host rock for some lead, zinc, and copper stores.