The total number of correct matchings Main Mineral / Compound Ore Name (a) K 2 MgCl 4 ⋅ 6 H 2 O Carnalite (b) Al 2 O 3 Corundum (c) Ca 3 ( PO 4 ) 2 Calamine (d) 3 Ag 2 S . Sb 2 S 3

Question

The total number of correct matchings

Main Mineral / Compound Ore Name

(a) $K_{2} MgCl_{4} \cdot 6 H_{2} O$ Carnalite

(b) $Al_{2} O_{3}$ Corundum

(c) $Ca_{3} (PO_{4})_{2}$ Calamine

(d) $3 Ag_{2} S . Sb_{2} S_{3}$ Argentite

(e) $2 CuCO_{3} \cdot Cu (OH)_{2}$ Malachite

(f) $PbSO_{4}$ Anglesite

(g) $K_{2} Mg_{2} (SO_{4})_{3}$ Magnelite

(h) $ZnCO_{3}$ Zinc blende

TestHub · Accepted Answer

(a) K₂MgCl₄·6H₂O → Carnallite

Carnallite is a hydrated double salt of potassium and magnesium chloride, so this match is correct.

(b) Al₂O₃ → Corundum

Corundum is the natural form of aluminium oxide, so this is also correct.

(f) PbSO₄ → Anglesite

Anglesite is lead sulfate ore, so this match is correct.

Other options are incorrect because:

Calamine is ZnCO₃, not Ca₃(PO₄)₂

Argentite is Ag₂S, not 3Ag₂S·Sb₂S₃

ZnCO₃ is Smithsonite, not Zinc blende (ZnS)

Chemistry - Metallurgy Question with Solution | TestHub