Question

An ore of potassium is:

• A. bauxite
• B. dolomite
• C. carnallite
• D. cryolite

Answer 1

The correct option is C

carnallite

Explanation of the correct option:

(C):

• Ore: Minerals from which an element can be extracted profitably are called ores
• An ore of Potassium (K) is carnallite.
• The structural formula is $\mathrm{KCl}.{\mathrm{MgCl}}_2.6{\mathrm{H}}_2\mathrm{O}$

Explanation of the incorrect options:

(A):

• Bauxite is an ore of Aluminium (Al) and its formula is ${\mathrm{Al}}_2{\mathrm{O}}_3.2{\mathrm{H}}_2\mathrm{O}$

(B):

• Dolomite is an ore of Magnesium (Mg) and its formula is ${\mathrm{MgCO}}_3·{\mathrm{CaCO}}_3$

(D):

• Cryolite is a chief ore of Aluminium (Al) and its formula is ${\mathrm{Na}}_3{\mathrm{AlF}}_6$

Hence, option (C) is correct.